Codex
The organs and tissue you infect, nose to brain.
The air channel behind the nose, lined with mucous membrane. It warms, humidifies and filters the air you breathe.
In the game
The first organ: pink tissue with mucus puddles. Its boss is the Mast Cell.
Fun fact: Most respiratory viruses, including influenza, begin their infection here.
The network of vessels carrying about 5 litres of blood around the body every minute, filled with red cells, platelets and immune cells.
In the game
The third organ. Blood flow pushes you in pulses with each heartbeat, and red blood cells stream past. Its boss is the Plasma Cell.
Fun fact: Laid end to end, your blood vessels would stretch around 100,000 km, more than twice around the Earth.
Appears inOrgan MilestonesThe Eight OrgansTissue Hazards & TerrainThe Organ MapPetri LabMenus & MetaAudio & Presentation
A bean-sized checkpoint where immune cells gather. Lymph drains through it, and B and T cells meet the antigens dendritic cells bring in.
In the game
The fourth area. Blue follicles full of lymphocytes. Helper T cells rally others; follicular dendritic cells snare you in webs. Its boss is the Follicular Helper T Cell.
Fun fact: You have around 600 lymph nodes; swollen glands during a cold are nodes busy fighting.
Appears inOrgan MilestonesThe Eight OrgansThe Organ MapAudio & Presentation
The intestines: a lining of finger-like villi covered in mucus, home to trillions of bacteria and about 70% of the body's immune cells.
In the game
The fifth area. Swaying villi line the walls. Goblet cells lob slowing mucus, IgA plasma cells fire sticky antibodies. Its boss is the Paneth Cell.
Fun fact: Spread flat, the small intestine's surface would cover about half a badminton court.
Appears inOrgan MilestonesThe Eight OrgansThe Organ MapAudio & Presentation
The body's chemical factory and filter. Blood from the gut flows through its hexagonal lobules, where resident macrophages catch anything foreign.
In the game
The sixth area. Hexagonal lobules, each with a central vein. Stellate cells scar the floor, invisible NKT cells ambush you. Its boss is the Kupffer Cell.
Fun fact: The liver can regrow from as little as a quarter of its original size.
Appears inOrgan MilestonesThe Eight OrgansThe Organ MapAudio & Presentation
Soft tissue inside bones where every blood cell is made: hundreds of billions a day, from a small pool of stem cells.
In the game
The seventh area. Bone struts and fat cells. Megakaryocytes shed platelets, myeloblasts burst into neutrophils. Its boss is the Hematopoietic Stem Cell.
Fun fact: Your marrow makes about 2 million new red blood cells every second.
Appears inOrgan MilestonesThe Eight OrgansThe Organ MapAudio & Presentation
Protected by the blood-brain barrier, the brain has its own immune system run mostly by microglia and astrocytes.
In the game
The final area. A web of neurons sparks across the floor. Astrocytes shield other cells, resident memory T cells teleport next to you. Behind the blood-brain barrier every cell takes 38% less damage from you. Its boss is the Microglia.
Fun fact: The brain has around 86 billion neurons and roughly as many glial cells supporting them.
Appears inOrgan MilestonesThe Eight OrgansTissue Hazards & TerrainAdaptive ImmunityThe Organ MapInfect Game ModeAudio & Presentation
A sticky gel made of water and mucins that traps dust and microbes before they reach deeper airways.
In the game
Green puddles that slow you (unless you carry the Mucolytic Enzyme). Mucus plugs seal some doors.
Fun fact: Your airways make roughly a litre of mucus a day.
Appears inTissue Hazards & TerrainHazards, Pits & ShaftsModifier CombosHosts & Genome
Tiny hair-like structures on airway cells that beat in waves to sweep mucus toward the throat.
In the game
The swaying hairs that line the walls of the Nasal Passage.
Fun fact: Influenza damages cilia, which is part of why a flu leaves you with a lingering cough.
Appears inHosts & Genome
The organs of breathing, where oxygen enters the blood and carbon dioxide leaves it.
In the game
The second organ, reached through the Mast Cell's portal. Breathing currents push you around.
Fun fact: Spread flat, the surface of the lungs' air sacs would cover roughly half a tennis court.
Appears inOrgan MilestonesThe Eight OrgansTissue Hazards & TerrainThe Organ MapInfect Game ModeThe CodexAudio & Presentation
Microscopic air sacs at the ends of the airways where gas exchange with the blood happens.
In the game
The bubbles in lung rooms; the Alveolar Macrophage guards them.
Fun fact: Each lung has hundreds of millions of alveoli.
