Characters & Symbols Library

a small round white DISC pressed against a character

deep PURPLE color — a purple robe, or a spilled puddle of purple crystal-violet stain

a HEART with lumpy cauliflower growths on its valves

a pair of coughing LUNGS (post-viral: a small cartoon flu VIRUS beside them)

a SHIELD deflecting small Y-shaped antibodies

a CLEAR ring cleared inside a red blood-agar pool

a BROWN/black agar slant or brown spill

a glass/beaker overflowing with fizzing white BUBBLES

A small statue of a cat on the changing table is tipped over and has a faint 'no' symbol over it.

coagulase + = a goblet pouring thick CLOTTING red blood; coagulase – = a thin CLEAR watery stream that stays runny and never clots

an ARMORED boss in a dark helmet (or a hazard WARNING sign) the normal attackers can't hurt

a SALT shaker / pile of salt the organism happily sits in

A glowing light bulb, its glass bent into the shape of the Greek letter 'β', hangs over a red rug, burning a perfectly clear, transparent hole in its center.

A functional, spleen-shaped security drone attempts to grab the protagonist, but its claws slide harmlessly off a shimmering, transparent capsular shield that surrounds the character. The drone looks frustrated but is not damaged.

a white delivery VAN (often crashing through a wall)

a character whose body is a tight bunch of round GRAPES

a TOILET and/or a swollen red inflamed BLADDER

The baby's crib is protected by a shimmering, transparent, dome-like energy shield.

A hospital marquee sign shaped like a swollen red heart, spelling "J♡NES" in tall bulb letters with the "O" lit as an anatomical heart. Each letter has its own small prop hanging beneath it: J = a knee brace that hops from one big joint to the next (migratory polyarthritis); ♡ = a heart wrapped in three glowing layers with the mitral valve circled (pancarditis, mitral first); N = a row of smooth pebbles under the skin of a forearm (painless subcutaneous nodules); E = a red ring with a pale, cleared middle painted on a torso (erythema marginatum); S = a marionette jerking on tangled strings (Sydenham chorea). A scarf knotted tight at a sore throat sits under the sign: rheumatic fever follows throat infection only.

A honey jar tipped over a child's cheek, leaving a dried, golden-amber crust around the nose and mouth (impetigo's honey-colored crust). Nearby on the shin, a bright red raised plateau like a miniature mesa, with a sharp cliff edge where it meets normal skin (erysipelas: raised, sharply demarcated). The honey crust is the main focal object.

The central character is a single baby in a high-tech crib. On the wall behind the crib hangs a framed photograph of a kindly elderly woman knitting in a rocking chair; next to her is a small table with a jar of sugar-free candy, indicating diabetes.

The veterinarian holds up a tablet computer. On the screen is a magnified, cross-section view of a single large host cell. Inside this cell, small rod-shaped bacteria are seen multiplying. No bacteria are visible outside the cell on the tablet's screen, emphasizing their confinement.

The antagonists are a swarm of malevolent, translucent-blue water spirits, representing the 'legion' of Legionella. Each spirit is distinctly rod-shaped, reinforcing the bacterium's morphology. They are shown actively thriving and multiplying within a large decorative fountain in the center of the scene, before bursting out into the air, demonstrating their facultative nature as they can survive without a host.

In a display area of the hall, a vintage Pontiac car is parked, referencing Pontiac fever. The car has a massive, exposed engine with a large air intake valve labeled 'PURE AIR ENGINE'. A mechanic is polishing the chrome bumper with a blue can of 'OXIDE-AWAY POLISH' that has a prominent blue '+' on the label. On his nearby tool cart, a 'CATALYTIC CONVERTER' is sitting in a tray, bubbling furiously, with a red '+' sign sticker next to it.

On a veterinarian's clipboard is a diagnostic report. One section is titled 'ACUTE PHASE'. Under this heading is a diagram of a weak-looking bacterium with a short, tattered cloak, cowering inside a petri dish. A large, bold Roman numeral 'II' is stamped over the petri dish. An antibody-shaped figure is easily slapping cuffs on the weak bacterium.

A bacterial agent wearing a long, smooth, perfectly intact black trench coat (representing full-length LPS) looks menacing and competent. It is actively and successfully carrying out its mission inside the host cell, contrasting sharply with its tattered-coat counterparts who look weak and ineffective.

A kid on a sofa holding up a tall glass of dark brown cola (cola-colored hematuric urine), both eyes puffed into pillows (periorbital edema). One knee has a scab (prior skin infection) and a scarf is wrapped around the throat (prior pharyngitis): PSGN can follow either. A wall calendar shows "2-4 weeks later", a tangled red coil of glomerular loops behind the sofa is studded with lumpy deposits (immune-complex humps), and a balloon marked "C3" hangs half-deflated (low complement).

In a hospital room, a nurse examines a tablet displaying a cross-section of skin. The top layer is clearly labeled 'EPIDERMIS' and is dotted with a few, sparse, faint-purple grape-like clusters, representing harmless normal flora. The nurse looks from the benign diagram on the tablet to the patient's angry, infected knee with a concerned expression, highlighting the contrast between normal colonization and active infection.

A victorious Roman legionnaire stands on a winner's podium, his ornate golden breastplate embossed with a large, bold number '1'. He holds a golden laurel wreath trophy high. Behind and below him, a crowd of other legionnaires with indistinct, faded numbers on their standard-issue armor look up at him, signifying their lesser prevalence.

Within the main dust cloud, a magnified inset reveals the infectious particles. They are not classic round spores, but rather desiccated, rod-shaped bacteria encased in cracked, hardened, seed-like shells. To emphasize their resilience, some of these particles are shown bouncing harmlessly off a hot, glowing branding iron that has fallen into the hay. On the vet's clipboard, a diagram points to one of these particles with the label 'Spore-LIKE SCV'.

The wallpaper in the hospital room has a decorative pattern of purple, grape-like clusters.

A central warrior character with the head and horns of a bull, representing the organism's former name, 'bovis'. He wears a Gallic-style helmet for 'gallolyticus'. Prominently emblazoned on the front of this helmet is a large, stylized red crab, the classic symbol for carcinoma.

A large, steaming cauldron-like phagolysosome is filled with bubbling, bright yellow lemon juice and sliced lemons. A small bacterium, having just fallen in, begins to glow with a vibrant energy, its eyes widening in activation as it starts to rapidly divide. Other bacteria already in the lemon juice are similarly energized and multiplying.

A large, misty aerosol cloud fills the air of the hotel lobby. Feeding into this cloud are multiple water sources: a rusty air conditioning vent in the ceiling, a hotel showerhead on the wall, and a decorative fountain in the background. An ill veteran stands in the cloud, inhaling the mist. He then turns and coughs directly at a nearby healthy veteran, but instead of infectious droplets, harmless, iridescent soap bubbles emerge from his mouth and pop before reaching the other person, who remains completely unaffected.

a GREEN halo/zone around the colony

a heavy WARPED unbreakable padlock that beta-lactam keys can't open

In a hotel utility closet, a maintenance worker examines a slimy water filter under a microscope. A large, circular inset shows the microscopic view: a large, blobby amoeba is acting as a shield, with tiny, C-shaped chlorine particles bouncing harmlessly off its surface. Inside the amoeba's translucent body, numerous small, rod-shaped bacteria are visibly multiplying, safe from the disinfectant.

a blue-white medic-KNIGHT wielding a giant syringe against ordinary (non-resistant) minions

a thick translucent CAPSULE shell encasing the organism

thick glistening TEAL-BLUE SLIME coating plastic surfaces

A pair of scissors (the peptidase) snipping the tail off a glowing distress-flare / signal beacon stamped "C5a" — the cut tail falls away and the beacon's light goes DARK. Around the dead beacon, neutrophil rescue-dogs (PMN sniffer dogs) wander lost in the fog with question marks, unable to find the bug, so no pus forms.

The Legionella monster exhales a single, wide, misty aerosol cloud that engulfs two different veterans. The veteran directly in the center of the blast is collapsed on his knees, gasping for air and clutching his chest in agony, representing severe Legionnaires' disease pneumonia. A second veteran, standing at the far edge of the same mist cloud, is only lightly affected; he remains on his feet, merely looking feverish and wiping sweat from his brow. He is distractedly jingling a set of car keys, and through the hotel's glass doors, a vintage Pontiac car is clearly visible in the parking lot, representing the milder, flu-like Pontiac Fever.

A plush, V-shaped velvet chair sits in the corner of the room.

The phagolysosome has been remodeled into a massive, spacious vacuole that takes up a large portion of the macrophage, providing ample room for bacterial replication.

A large banner hangs across the back wall of the hotel convention hall, clearly reading 'AMERICAN LEGION CONVENTION 1976'.

A large security guard labeled "MACRO-PHAGE" holds a cage (phagosome) containing several Legionella bacteria, who are multiplying inside. However, the cage is flimsy, and some bacteria are squeezing through the bars. These escapees are landing on a nearby buffet table with a charcoal-black surface, which is sprinkled with iron filings and shiny cysteine crystals. On this special buffet, the escaped bacteria are happily multiplying, forming visible colonies.

In the infirmary, a doctor points to a computer monitor displaying a two-panel analysis. The left panel is a micrograph of a lung sample, showing a large security guard cell with 'MAC' embroidered on his jacket. Inside the guard's jacket, numerous small rod-shaped bacteria are multiplying, having disabled his taser (which represents the lysosome). The right panel shows a live lab-camera feed of the exact same rod-shaped bacteria thriving and multiplying openly on a black charcoal agar plate. A large, two-headed arrow connects the two panels, labeled 'FACULTATIVE', demonstrating the organism's ability to live in either environment.

On a wooden crate next to the veterinarian, there is a clipboard with an animal shipping manifest. The top of the document features a prominent world map, and numerous colorful shipping stamps are scattered across all the continents, indicating global transport of livestock.

In a college dorm room, a sick adolescent student is slumped over his desk. On his laptop screen is a video call with his mother, who is holding a visibly ill infant. The student's roommate, who appears healthy, is in the background, actively packing a military-style duffel bag next to a bunk bed, clearly preparing for deployment or training.

The scene is a messy college dorm room, representing close quarters. A sick adolescent student lies in bed, wearing a military-style ROTC t-shirt (representing military barracks). Incongruously placed right next to his bed is a baby's crib. The sick student is weakly reaching a hand into the crib, visually linking the two high-risk age groups.

The elderly veteran protagonist is smoking a cigarette. Pinned to his uniform is a medal shaped like a pair of blackened, tar-stained lungs. Floating next to his shoulder is a ghostly, cartoon T-lymphocyte cell that is visibly cracked and flickering, with a small, red 'low battery' symbol glowing on it.

A military-style patch on the veteran's jacket is frayed and tearing off. The patch depicts a T-shaped commando figure with a prominent number '1' on his helmet. He is holding a gamma-shaped (γ) bugle to his lips, but the bugle is visibly cracked and emitting a weak puff of smoke instead of a powerful blast.

a matched PAIR of pointed lancets / two organisms tip-to-tip

a bright canary-YELLOW patch in/near the blood pool (mannitol salt agar)

On the nursery wall hangs a large, circular pregnancy wheel calculator. The indicator arrow is pointing to a clearly highlighted section of the wheel labeled '35-37 WEEKS'.

The baby is wearing a soft, padded helmet with a brain or meninges pattern on it.

The baby holds a rattle shaped like a pair of lungs and is blowing a single bubble.

The baby, looking pale and lethargic, lies in a futuristic crib. A tiny, deflated blood pressure cuff hangs limply from its arm. A glowing red digital thermometer is stuck to its forehead, flashing a dangerously high temperature.

A long, flexible endoscope tube snakes into the scene from the upper right. At its tip, a small light illuminates the area, and a pair of tiny biopsy forceps extends out. These forceps are shown pinching and removing a small piece of the crab-shaped tumor, clearly demonstrating a diagnostic, sample-taking procedure rather than a therapeutic action.

In the background, there is an ornate, velvet-roped entrance to a club built into the colon wall. A prominent sign above the entrance clearly reads 'ENTERO-COCCUS CLUB'. The bull warrior stands outside the entrance, blocked by the velvet rope, unable to get in.

The scene is set inside the colon. On one side, the colon wall is depicted as healthy, pink, and intact. Here, the Gallic Bull warrior is seen peacefully sitting and leaning against the wall, establishing his role as a normal, non-pathogenic commensal resident. This calm area contrasts with the main action elsewhere in the scene.

a cracked/gnawed BONE

A dramatic cutaway view slices through a veteran's chest, revealing the lung's interior. Inside a large, guard-like alveolar macrophage cell, the invading rod-shaped bacteria are safely enclosed within a shimmering, impenetrable bubble (the altered phagosome). A frantic, janitor-like figure inside the macrophage (a lysosome) futilely sprays the bubble with a bottle clearly labeled 'LYSOL', but the cleaning spray harmlessly bounces off. Inside this protective sphere, the bacteria are multiplying rapidly. The bubble itself is sustained by four thin, glowing filaments extending from the bacteria, representing the Type IV secretion system's effector proteins.

a PILL/capsule of penicillin

On the vet's tablet screen, inside the host cell, the bacteria are shown thriving inside a steaming, bubbling cauldron. To signify the harsh environment of the phagolysosome, a tiny cellular worker is pouring in a can of "Lysol" disinfectant and a bottle of "Faygo" soda. The cauldron has a small, stenciled label on its side that reads "PHAGO-LYSOSOME".

A group of bacterial agents are shown changing their appearance by wearing reversible coats. One agent is caught mid-action, flipping its coat from a smooth, slick black side to a rough, tattered, and faded brown side. Nearby, some agents sport the smooth black coats while others wear the tattered brown ones, demonstrating the two distinct phases.

The farm setting features the primary animal reservoirs: a ewe that has just given birth, along with a goat and a cow in the background.

On the floor is a board game box that reads 'MAC Attack!'. The game pieces, shaped like cylinders and numbered 5, 6, 7, 8, and 9, are all broken and scattered, unable to form the complete membrane attack complex.

On a TV screen in the dorm room, a video game is paused. The game shows a fortress shaped like a pair of kidney beans (a diplococcus). A circular battery of cannons, clearly labeled 'C5' through 'C9', is aimed at the fortress. However, the cannons are all cracked, smoking, and malfunctioning, their cannonballs lying uselessly on the ground, having failed to breach the fortress wall.

The protagonist is a veterinarian, identifiable by his attire, who is looking sick and feverish while on the job at the farm.

A frustrated nurse in gloves tries to apply antibiotic cream from a tube printed with a square beta-lactam ring. The cream slides right off the slick, slimy biofilm on an infected joint implant in a useless glob. Tiny white-knight immune cells slip and slide on the same surface, unable to reach the bacteria.

a swollen, red, inflamed KNEE joint

The bold number '1' on the urine antigen test strip is the primary symbol for this concept.

A large, misty aerosol cloud fills the convention hall. This cloud is fed by multiple distinct man-made water sources: a rusty air conditioning vent in the ceiling, a large decorative fountain in the background, and a steamy showerhead visible through an ajar hotel room door. An elderly veteran inhales the mist. He then turns and coughs directly at a nearby healthy person, but only harmless, iridescent soap bubbles emerge from his mouth and pop, indicating no person-to-person transmission.

In the center of the barn, a ewe has just given birth. A large, thick, swirling dust cloud, representing the infectious aerosol, rises directly from the discarded placenta and amniotic fluid on the hay-strewn floor. To show other sources, smaller, thinner wisps of dust are also rising from dried animal droppings and a patch of urine elsewhere on the barn floor, contributing to the main cloud.

organisms linked together in a CHAIN

The sick vet coughs in the direction of a healthy farmhand, but harmless, iridescent soap bubbles emerge and pop, indicating no effective transmission.

The main focus is the veterinarian inhaling a massive dust cloud. In the background, occupying a much smaller part of the scene, a farmhand starts to tip a small metal pail of unpasteurized milk to his lips. The sick veterinarian, who is coughing from the aerosol, weakly raises a hand to wave him off, showing it's a potential danger but visually subordinating it to the primary inhalation route.

The veterinarian is shown directly inhaling the aerosolized dust cloud that has been kicked up from the contaminated ground.

A concerned roommate leans in very close to the sick student's face, as if to hear a whispered secret. As the sick student whispers, a fine, visible mist of respiratory droplets passes directly from his mouth to the roommate's, traveling the short distance between them.

A bacterium character wields a complex, syringe-like device with four distinct nozzles at its tip. It presses this four-pronged injector against the membrane of the surrounding vacuole, pumping streams of brightly colored proteins through all four nozzles simultaneously, causing the vacuole wall to visibly bulge and expand.

A veterinarian is focused on a pregnant ewe. A single tick is crawling on the vet's arm, but he casually flicks it away with one finger, his gaze remaining on the sheep, clearly unconcerned by the tick. Meanwhile, other ticks are visibly attached to the sheep's woolly coat, crawling from one animal to another nearby.

A magnified inset shows a cross-section of a blood vessel wall, depicted as a concrete structure reinforced with steel rebar. Tiny bacteria are attached to the inner wall, planting small, blocky demolition charges that have short, sparking fuses. Each charge is clearly stenciled with the letters 'L.O.S.' to represent Lipooligosaccharide. The wall is crumbling and cracking where the charges have detonated, allowing red blood cells to leak out.

The student's blanket has a pattern of lumpy, short-chained sugar molecules with lipid anchors (LOS). The blanket is emitting sparks that are hitting a nearby model ship, causing it to break into tiny pieces, symbolizing DIC.

On a computer monitor on the desk, a space-shooter video game is paused. The player's ship is a large, capital 'A' inside a Y-shaped shield. An enemy ship has just fired a scissor-shaped laser that has struck the Y-shield at its central hinge point, causing the two arms of the 'Y' to crack and break off.

Taped to the dorm room wall is a comic book poster of a Y-shaped superhero who has a large, bold letter 'A' emblazoned on his chest. A small, mischievous gremlin-like villain is using a large pair of shears to snip through the hero's flexible armor right at the arm 'hinges', causing the hero's arms to detach and fall off.

On the upper-left colon wall is a large, dark, malignant-looking tumor shaped like a crab. A significant breach is visible in the tumor, but its edges are crumbling, necrotic, and discolored, clearly indicating a pre-existing, decaying opening. The bull warrior is shown casually walking through this opening from the colon lumen into the background, not actively climbing, breaking, or creating the hole, signifying opportunistic entry through a compromised barrier.

Below the main tumor, a patch of the colon wall is bright red and inflamed, covered in shallow, bleeding craters characteristic of ulcerative colitis. The bull warrior is depicted tiptoeing stealthily past this area, using the inflamed terrain for cover. He is not touching, digging, or interacting with the ulcers, making it clear the inflammation is an independent condition that he is merely exploiting.

A small figure in a jersey marked "B" stands next to a white antibiotic disc stamped "B" and shrugs while the disc bounces off harmlessly. Growth reaches right up to the edge of the disc with no clear ring.

A small toy camping tent on the changing table points towards a golden staff, forming an arrowhead shape of light where they meet.

The Gallic Bull warrior wields a menacing flail as a weapon. The weapon consists of a handle attached to a long chain composed of distinct violet spheres, perfectly illustrating the 'cocci in chains' morphology.

An old, weary sheriff with a prominent 'IgG' on his badge stands next to a heart-shaped bulletin board. The board is covered in thorny, barnacle-like growths, representing endocarditis. Pinned to the board is a yellowed, tattered 'WANTED' poster. The poster features a drawing of a tough-looking bacterium in a long, pristine cloak, labeled with a Roman numeral 'I'. Below the image, the poster reads 'CHRONIC FUGITIVE' and offers a 'HIGH TITER REWARD'.

The Gallic Bull warrior attacks the vegetation-covered heart valve with a flaming torch (representing fever). As it strikes the valve, the valve vibrates and emits musical notes (representing a new heart murmur).

The student protagonist is slumped against a dormitory wall, clearly displaying the classic triad of meningitis. He is flushed red and sweating profusely from a high FEVER. He is clutching his temples with both hands, his face contorted in pain from a severe HEADACHE. His neck is bent backwards at an unnaturally stiff, rigid angle, chin pointing up, indicating NUCHAL RIGIDITY.

On the student's messy nightstand sits a lumbar puncture kit. Next to it, a prominent test tube is filled with thick, cloudy, pus-like fluid containing tiny, angry-faced cartoon neutrophils with multi-lobed nuclei. An empty juice box with a simple hexagon icon (for glucose) is squeezed completely flat, while next to it, a tub of protein powder is overflowing with a thick, goopy mound.

The student's skin is covered with a widespread, purple-red, pinprick-like petechial rash. A paramedic is pressing a clear drinking glass against his arm, and the spots underneath remain visible, demonstrating that the rash is non-blanching.

The sick student, wearing a short-sleeved shirt, has a dark purple petechial rash covering his torso and upper arms. His roommate presses a clear drinking glass against his chest, and the purple spots remain clearly visible through the glass. Critically, the student's lower arms, wrists, and hands are completely clear of any rash, creating a stark visual boundary where the rash stops.

A medical monitor has fallen to the floor next to the protagonist. Its display shows a thermometer pushed into the red zone (high fever), but the EKG heart trace is beating very slowly and calmly, indicating a heart rate that is inappropriately low for the fever.

The student, now collapsing, wears a fanny pack shaped exactly like the adrenal glands. This 'adrenal' pack has burst open, and a thick, dark RED, blood-like fluid is gushing out, staining his clothes and pooling on the floor. A nearby paramedic's blood pressure monitor shows a critically low reading, with the cuff on the student's arm.

The sick student is slumped over in bed, appearing in shock. On the wall behind him is a dramatic poster of a large house being completely inundated by a massive wave of water. A blood pressure cuff on the student's arm has its gauge shattered and reading zero. On the back of his gown, positioned over his lower back, are two distinct, triangular, yellowish patches that are soaked through with dark, seeping blood.

An old Legionnaire veteran, looking frustrated and disoriented, holds a large, unfolded map. The map is labeled 'PHILADELPHIA' at the top, but the streets are a tangled, nonsensical mess, like a plate of spaghetti, with street names overlapping and leading nowhere.

The veteran looks dazed, with question marks swirling around his head. He is trying to read a map of the convention hall but is holding it upside down.

The veteran, looking utterly perplexed, is holding his "American Legion Convention" name badge upside down, squinting at it as if he can't recognize his own name. The badge is clearly inverted, with the text "HELLO, my name is..." appearing flipped.

A veterinarian, looking feverish and sweating, leans against a hay bale inside the barn. He is anxiously studying a medical clipboard. On the form, under the 'Diagnosis' field, a doctor has handwritten the word 'QUERY?' in large, red letters, followed by a prominent question mark. The 'Q' of 'QUERY' is stylized to be particularly large and noticeable.

The sick veteran clutches his stomach with an anxious expression, looking towards a nearby bathroom door. Seeping from under the door is a puddle of clear, light-yellow fluid with distinct ripple marks spreading out, emphasizing its watery consistency.

The sick veteran is rushing towards a bathroom, and the door has a sign depicting a person with a waterfall of watery, non-bloody diarrhea.

The sick veteran is standing in the hotel lobby, looking bewildered at a large "You Are Here" map of the hotel. On the map, a frantic, dotted line traces a path from his hotel room all the way to a distant bathroom icon. The dotted line is drawn in a watery blue color and repeatedly passes a water fountain icon on its route, emphasizing the watery nature and frequency of his trips.

A mobile hanging over the changing table is made of a single string of purple, spherical beads.

On a changing table next to the crib, a gray, plastic toy hippopotamus is squirting a stream of clear water from its mouth into a baby bottle. The clear liquid inside the bottle is turning a deep, vibrant purple where the water stream makes contact.

A hotel luggage cart is parked nearby, but it's tilted awkwardly. One of its wheels has been replaced by a large, white, crumbling block of salt. The salt block-wheel is visibly lower than the other wheels, causing the cart to sag. The letters 'Na' are carved into the side of the salt block.

The sick veteran is sitting at a table in the hotel's cafe area. He is trying to season his food, vigorously shaking a salt shaker over his plate. However, the shaker is clearly empty, and only a single, tiny grain of salt falls out. The glass shaker has a large "Na+" symbol printed on it, and the veteran has a frustrated, weak expression.

The sick student's bedsheets have a repeating pattern of pink, kidney-bean-shaped pairs. On the floor beside the bed, a modern, multi-lobed, transparent robotic vacuum cleaner is at work. Through its clear casing, several of the pink kidney-bean pairs are visible, tumbling around inside its distinct compartments.

Through a large window, a vintage Pontiac Firebird car is parked outside the hotel. A sign next to it reads 'PONTIAC FEVER: MILD, SELF-LIMITED'. The car looks fine and is separate from the severe illness inside.

In a separate area, another veteran who looks only mildly ill (fever, malaise) is sitting with a classic 'PONTIAC' toy car. He is waving off a doctor trying to offer him antibiotics. The car's license plate reads 'MILD-FLU'.

In the hotel lobby, away from the main drama, another veteran looks only mildly ill (slight sweat on his brow) while playing with a vintage toy Pontiac car. He waves away a medic who is offering help.

A test strip on a lab bench with a dropper bottle labeled "PYR" beside it. The strip stays pale and unchanged after the drop.

The veteran wears a large, heart-shaped wristwatch with the brand name 'Faget's'. The watch face has two gauges: a thermometer dial pointing to a very high temperature, and a pulse dial pointing to an inappropriately low heart rate.

The veteran's wrist-watch style heart rate monitor displays a very slow snail, while the thermometer next to him shows a high fever.

A portable vital signs monitor is on the table next to the veteran. The screen displays a graph with two distinct lines. A fiery red line, labeled with a thermometer icon (TEMP), is soaring upwards to a high peak. In stark contrast, a cool blue line, labeled with a heart icon (PULSE), is plodding along as a nearly flat, low line at the bottom of the screen, failing to rise with the temperature.

The main victim is an elderly male veteran attending the convention. He is actively smoking a cigarette and holding a glass of whiskey, representing age, smoking, and alcohol use. His uniform is torn over his abdomen, revealing a large, healed, kidney-shaped surgical scar, symbolizing the risk factor of being an immunocompromised organ transplant recipient.

On the bedside table, a child's doll has a plastic tube running from its head down its back, representing a CSF shunt. This tube is also coated in the same slimy biofilm as the patient's knee.

The patient's leg is propped up, revealing a dehisced surgical wound on their knee. Exposed underneath the skin is a metallic and plastic prosthetic joint, with visible screws and an unnatural seam. This artificial joint is completely coated in a thick, slimy, translucent biofilm, teeming with dense, angry-looking purple grape clusters.

The protagonist is clutching his chest and coughing violently, with a giant thermometer next to him showing a very high temperature (over 39°C).

The sick veteran is slumped in a chair, sweating profusely, while a giant thermometer next to him displays a very high temperature (40°C / 104°F). Behind him, an illuminated X-ray view box is mounted on the wall. The chest X-ray displayed shows a hazy, patchy, and diffuse pattern of infiltrates scattered throughout both lungs, rather than a single, dense consolidation.

In the background, the patient's male roommate is partially visible, also clutching his lower abdomen in pain.

The patient's girlfriend, who is wearing a honeymoon-themed t-shirt, is sitting uncomfortably and clutching her lower abdomen in pain, suggestive of a UTI.

Hanging from the ceiling is a large, fleshy, heart-shaped valve. It is covered in friable, crumbly, cauliflower-like growths, representing the vegetations of subacute bacterial endocarditis.

The collapsing veteran clutches his chest and gasps for air, representing pneumonia. Dizzy swirls and question marks float around his head, indicating neurologic dysfunction and confusion. As he falls, a large, watery, translucent, light-brown splash clearly emanates from the seat of his pants, creating a puddle on the floor.

A veteran legionnaire is operating a barbecue grill filled with black charcoal briquettes. On the grill grate, a yeasty loaf of bread is toasting. Next to the bread, a C-shaped sausage is sizzling inside a cast-iron skillet. The sausage is visibly shaped like a capital letter 'C'.

In a corner of the convention hall, a catering station features a large, black buffet chafer filled with charcoal briquettes; a prominent sign on it reads 'B.C.Y.E. CHARCOAL BUFFET'. Next to the chafer, a nun wearing a name tag that says 'SISTER INEZ' is serving food. Beside her, a veteran has set up a small ironing board and is pressing his uniform with a heavy, old-fashioned cast IRON.

On a lab bench, a scientist is trying to cultivate the bacteria, which are depicted as tiny, picky legionnaire soldiers on a black plate representing Buffered Charcoal Yeast Extract (BCYE) agar. To make them grow, the scientist adds two essential supplements. First, he scrapes rust filings from an old IRON legionnaire's helmet onto the plate. Second, he adds drops from a bottle with a large, prominent number '16' on the label, representing L-cysteine.

The bull warrior sits confidently on a polyp-like stool on the colon floor. He holds an ornate chalice filled with a glowing, viscous, bright green liquid, and is shown taking a hearty drink from it with a look of satisfaction, demonstrating that he thrives in bile, not just tolerates it.

On the healthy roommate's desk, a medical textbook is open to a diagram comparing two bacteria. At the top of the page, a single blue-purple wand shaped like a plus sign (+) touches both columns, indicating both are oxidase-positive. The left column, under a drawing of a brain with inflamed meninges, shows two bubbling fermentation tubes. The first tube sits next to a pile of spilled gummy candies (glucose), and the second sits next to a box of malted milk balls (maltose). The right column, under a drawing of a gonk droid, also shows two tubes: the one by the gummy candies is bubbling, but the one by the malted milk balls is still and unreactive.

In the dorm room, the sick student in bed is happily juggling a glowing, gem-like glucose candy and a brown malted milk ball. His concerned roommate, standing nearby, holds an identical glowing glucose gem but is actively pushing away a proffered malted milk ball with a look of disgust.

A hotel mechanic in greasy overalls cautiously approaches the Legionella monster from behind. The monster has a small, sputtering exhaust pipe on its back, like a faulty engine. The mechanic holds a long dipstick with a cotton swab on the end directly in the path of the exhaust fumes. The cotton swab is glowing a deep, vibrant purple. The mechanic's metal toolbox sits on the floor nearby, and its side is emblazoned with a large, friendly logo of a cartoon ox.

On the food tray, a test tube has spilled from a machine labeled 'COAG-U-LATOR'. The red liquid (blood) remains liquid and has not clotted.

A petri dish shaped like a salt shaker (for Mannitol Salt Agar) sits on the tray. It is filled with a bright pink agar medium, and the bacterial colonies growing on it have not changed the color of the agar.

The girlfriend (S. saprophyticus) is easily winning a mobile game called 'NOVO BIOCIN RESIST-DANCE', showing resistance. In contrast, the patient (S. epidermidis) is wincing in pain as a nurse applies a small white novobiocin disc to his arm, showing sensitivity.

At a hotel banquet buffet, the Legionella monster is the only one eating a bizarre, specific dish. It greedily shoves handfuls of black charcoal powder from a serving dish into its mouth (Buffered Charcoal). In the center of the charcoal pile sits a frothy, overflowing beer stein, its yeasty foam spilling everywhere (Yeast Extract). A large, rusty iron girder is stuck into the charcoal like a garnish (Iron). Kneeling on the table right next to the dish is a small, reverent figurine of a praying nun, for the sound-alike 'sis-teine' (L-cysteine).

On the floor is a discarded flyer for a party at 'The Thayer-Martin Chocolate Lounge'. The flyer's artwork shows a velvet rope entrance with three distinct bouncers. The first bouncer uses a VAN to block a crowd of purple grape-like characters. The second bouncer sprays a can of COLA at a group of other pink rod-like characters, making them slip. The third bouncer, wearing a hat with 'NY' on it, uses a statue's torch to repel a cloud of fungal gnats. Waving past them all and entering the club are the pink diplococcus characters.

A medic is rushing into the scene from the right, holding up a diagnostic test tube filled with yellow urine. Inside the urine, a single bacterial antigen is glowing brightly, indicating a positive urine antigen test (which typically detects serogroup 1).

A taut beaded necklace of round purple beads strung single file (Gram-positive cocci in chains). Beside it, a beaker of hydrogen peroxide sits perfectly still with no bubbles at all (catalase-negative).

The entire floor of the scene is a solid, opaque red, representing a blood agar plate. A bright spotlight from above shines down on the bull warrior, casting a beam of light distinctly shaped like the Greek letter gamma (γ). Where this gamma-shaped light hits the red floor, there is absolutely no change in color or clearing; the floor remains uniformly red.

A small submarine is sinking low in a body of water. The side of the submarine is clearly labeled 'Na+'. Its power gauge is in the red zone, labeled 'LOW'.

As the veteran collapses, a clear glass salt shaker slips from his limp hand. The shaker is visibly almost empty, and only a few solitary grains of salt spill out onto the floor as it tumbles.

Dangling from the collapsing veteran's neck is a convention lanyard with a large, liver-shaped name tag. The tag is floating upwards as if filled with helium, pulling the lanyard taut. On the tag are two prominent, stylized letters: 'A' and 'T'.

The bull warrior wears a prominent, wide leather belt with a large, gleaming, golden buckle shaped like the capital letter 'D'.

In a corner of the scene, a crime scene investigator is examining a faint pink carpet. He uses a vintage press camera with a large, polished SILVER flashbulb. As the silver flashbulb goes off, it illuminates the pink carpet, revealing previously invisible, glowing, rod-shaped footprints, which represent the Legionella bacteria.

A mechanic is working on a sputtering old engine that is hooked up to a large, loud air compressor (obligate aerobe). The mechanic sprays the engine with a can labeled "OXI-DIZER" that has a large "+" on it, causing sparks (oxidase-positive). The engine's exhaust is fitted with a prominent "CAT-alytic converter," also marked with a "+" (catalase-positive). Nearby, a funnel full of sugar is being rejected by the engine's fuel intake, spilling onto the floor (asaccharolytic/non-fermenter). The engine's main fan belt, shaped like a Greek letter "β," is being actively shredded by the engine's gears, with broken pieces flying off (beta-lactamase production).

In a corner of the convention hall set up like a classic car show, a veteran tinkers with the engine of a vintage automobile. He's installing a large, clean air filter into the engine's prominent air intake, emphasizing the need for air (obligate aerobe). On the ground next to him is a spray can of chrome polish labeled 'OX-EYE-DAZER' with a large blue eyeball as its logo; he's just used it to clean a rusty, oxidized spot on the bumper, leaving a positive blue shine. Below the car, the catalytic converter is visibly bubbling, as if reacting energetically.

In a lab corner, a crime scene investigator uses a high-tech machine labeled 'PCR' that is rapidly printing out huge, clear stacks of DNA blueprints taken from one of the background legionnaires (who has a faded number '4' on his armor). This shows PCR's high sensitivity and its ability to detect non-serogroup 1 strains. Nearby, another investigator shines a flashlight labeled 'DFA' onto a similar sample. The flashlight's beam is weak and flickering, casting a very faint, dim green glow, and a small tag on it reads 'LESS SENSITIVE'.

At a makeshift lab station within the convention hall, a technician frowns at a urine antigen test strip floating in a sample cup; the strip is clearly marked 'NEGATIVE' and has a small tag that reads 'Sg 1 ONLY'. Turning to his other equipment, he points triumphantly at a PCR machine screen which displays a list of results: 'L. pneumophila Sg 1: NEGATIVE', but below it, highlighted in green: 'L. pneumophila Sg 6: POSITIVE' and 'L. micdadei: POSITIVE'. Next to the PCR machine, a microscope is focused on a slide, from which a brilliant green fluorescent light emanates, revealing glowing rod-shaped bacteria. A nearby bottle of reagent is clearly labeled with the bold letters 'DFA'.

On a wall is a framed microscope view of a Gram stain. The image is filled with large, multi-lobed purple cells representing neutrophils, but only a few, extremely faint pink rods are visible, some inside the neutrophils. Next to this frame, a polished silver water pitcher sits on a table, and its reflective surface shows a crystal-clear image of many distinct rod-shaped bacteria.

On a darkroom counter, there are two photo developing trays. The first tray, labeled 'GRAM STAIN', contains a pink-tinted photo paper where the image of rod-shaped bacteria is extremely faint and washed-out. A small tag on this tray reads 'POORLY STAINING GRAM-NEGATIVE'. The second tray, labeled 'SILVER STAIN', holds a photo with a crisp, clear, dark image of the same bacteria, which have a distinct metallic silver sheen.

A lab technician works in a darkroom area of the infirmary under a red safelight. The tech is developing two photographic plates. He pulls the first plate from a tray of pinkish-purple 'GRAM's Stain Developer', but the image is faint, washed-out, and blurry, showing only ghost-like outlines of neutrophils. He then pulls a second plate from an adjacent tray filled with a shimmering, metallic SILVER solution; this plate shows a perfectly crisp, high-contrast, black-and-white image of the rod-shaped bacteria, revealing them clearly.

On the shared food tray, a box of 'UREA-O's' cereal is fizzing where milk has spilled, releasing stinky ammonia gas clouds and forming small rock candy-like crystals (struvite stones).

A urine antigen test cup sits on the counter, displaying a positive result. The result window doesn't show a simple line; instead, a single, bold, glowing number '1' has appeared. This number '1' is depicted as a bouncer, wearing a sash that reads 'SEROGROUP', and it is physically blocking a crowd of other numbers (2, 3, 4, etc.) from entering the 'Positive Result Club'.

In the lower right, a large, cracked laboratory test tube lies on its side, having spilled a pile of coarse, crystalline salt. The bull warrior has stepped in this pile, and its leg armor is visibly corroding, smoking, and dissolving where it makes contact with the salt. A clean, simple label on the test tube is clearly legible.

A fluffy white cat on the floor is playfully batting at bubbles emerging from a spilled bottle of hydrogen peroxide, causing them to pop.

A cracked life-ring shaped like a big letter "O" floating in a pool of clear red jelly (beta-hemolysis). A Y-shaped antibody claw-grabber reaches down and clamps the ring: anti-streptolysin-O, the ASO titer. A clock is pinned to the grabber's handle: the titer dates a recent infection; it does not cause the valve damage.

A medic in a hotel bathroom examines a urine test strip which is turning positive. Next to the sink sits the open test kit box. The box prominently displays a large, bold number "1" and the text "SEROGROUP 1 ONLY". Below this, a diagram shows a single bacterium labeled "1" with a green checkmark, while a crowd of other bacteria labeled "2", "3", etc., are crossed out with a red "X".

A giant, elegant fountain pen is jabbing the bull warrior. The warrior's body is constructed of red bricks, like a brick wall. The nib of the fountain pen is acting like an eraser, magically dissolving the mortar between the bricks. Where the pen touches, the bricks are crumbling and falling away, causing the warrior to disintegrate.

An IV line snakes into the room from off-screen, implying it is connected to the mother. The IV bag at the edge of the scene is labeled "PCN". The line plugs into the base of the baby's crib and powers a protective energy shield around the infant.

In the background, a healthy roommate shrinks away from the sick student. A public health officer in a distinct uniform is using a giant, conspicuous thumbtack to pin a small, sturdy, orange-colored roof tile over the roommate's nose and mouth area.

A paramedic wearing a chef's hat and a bronze '3rd' place medal rushes toward the sick student. He holds a large, ornate key. The key's head is shaped like a squid (a cephalopod), and its handle is shaped like a single axe head. He is using this key to unlock a glowing, translucent barrier surrounding the student's head, which represents the blood-brain barrier and access to the CNS.

In the center of the scene, a heroic janitor in a hazmat suit is cleaning up the bacterial outbreak. In one hand, the janitor wields a giant, powerful, U-shaped magnet on a wheeled cart; it is actively pulling small, rod-shaped bacteria right through the wall of a large, transparent, spherical containment unit that represents an intracellular environment. The magnet has the word 'MACRO' clearly written on its side. In the janitor's other hand is a high-tech floor polisher with a flower-shaped head, which is aimed at the extracted bacteria, shredding their unwinding, coil-shaped DNA. On the floor nearby lies a single, square-shaped metal ring that has been snapped in half, clearly broken and discarded.

A medic rushes to the "MACRO-PHAGE" guard's cage. The medic uses two distinct tools to free the prisoners. First, a giant CROWBAR with a sliding handle ("Ma-CROW-slide") is being used to pry open the cage bars. Second, the medic, dressed like a falconer, has sent a trained FALCON swooping down; the falcon carries a key in its talons ("FALCON-olone") and is inserting it into the cage's lock.

In a medical tent, a medic is treating a sick veteran by targeting the intracellular bacteria. He aims a special gun at a large, translucent macrophage-shaped target, inside of which tiny rod-shaped bacteria are hiding. The medic loads his weapon by sliding in a large, curved magazine shaped like a piece of macaroni ('macaroni-slide' for Macrolide). On a table next to him is another ammo choice: a box overflowing with darts that have flowers for heads and quail feathers for fletching ('flower-quails' for Fluoroquinolones). On the floor, a pile of bent and shattered penicillin-syringes lies useless, clearly showing that beta-lactams are ineffective against these hidden bacteria.

On the wall, separate from the A, C, W, Y balloon chain, there is a single balloon shaped like the letter 'B'. This 'B' balloon is printed with the exact same pattern as the dorm room wallpaper, making it camouflaged and hard to see. Next to this balloon is a poster titled 'PLAN B'. The poster depicts a syringe being filled with small, interlocking protein puzzle pieces.

On a college bulletin board, a large recruitment poster depicts a vibrant parade. A powerful horse constructed from interlocking protein-chain blocks is pulling a colorful float. On the float are four large, friendly characters literally shaped like the letters 'A', 'C', 'W', and 'Y'. These letter-characters are constructed from glistening, interconnected sugar cubes and are all linked together by a rope, emphasizing they are part of a single conjugate vaccine.

On the wall of the dorm room, a friendly college tutor character, wearing a shirt with a large capital 'T' on it, is hanging a chain of party decorations. The decorations are four large, colorful, mylar balloons shaped like the letters A, C, W, and Y. The balloons are all tied (conjugated) together by a single, sturdy rope that the tutor is holding.