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immune system disorder
Table of Contents
References & Edit History Related Topics
Images & Videos
T cell infected with HIV
Learn about the hygiene hypothesis and understand how exposure to certain germs help develop a child's immunity
anaphylaxis Pathways of complement activation targeted therapy for cancer; rituximab
Quizzes
Encyclopaedia Britannica thistle graphic to be used with a Mendel/Consumer quiz in place of a photograph.
44 Questions from Britannica’s Most Popular Health and Medicine Quizzes
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Macro Aedes aegypti Mosquito. Close up a Mosquito sucking human blood,
Why Do Mosquito Bites Itch?
Image concept with the result of the HIV test, AIDS
What’s the Difference Between HIV and AIDS?
HIV, AIDS, virus
HIV/AIDS: Just the Facts
Red AIDS ribbon. AIDS awareness. AIDS charity. Red ribbon. AIDS disease deficiency HIV.
World AIDS Day
Hand washing. Healthcare worker washing hands in hospital sink under running water. contagious diseases wash hands, handwashing hygiene, virus, human health
17 Questions About Health and Wellness Answered
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The tomb of Saint Nicholas in the crypt of the Basilica di San Nicola, Bari, Apulia, Italy
Do the Relics of Saint Nicholas Really Emit a Holy Substance?
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.
9 of the World’s Deadliest Mammals
Thanksgiving Turkey with all the sides
Why Do We Eat Turkey on Thanksgiving?
Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)
7 of the World’s Deadliest Shipwrecks
Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro
Why Is Christmas in December?
illustration of the walking titanosaurus, Patagotitan mayorum
Titanosaurs: 8 of the World's Biggest Dinosaurs

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Videos

Learn about the hygiene hypothesis and understand how exposure to certain germs help develop a child's immunity
Research suggests that exposure to germs early in life helps a child develop a healthy...
Video: Science in Seconds (www.scienceinseconds.com) (A Britannica Publishing Partner)

Images

T cell infected with HIV
False-colour scanning electron micrograph of a T cell infected with HIV (human immunodeficiency...
© NIBSC, Science Photo Library/Photo Researchers, Inc.
anaphylaxis
Systemic anaphylactic response to bee venom in an individual with type I hypersensitivity....
Encyclopædia Britannica, Inc.
Pathways of complement activation
The main function of complement proteins is to aid in the destruction of pathogens...
Encyclopædia Britannica, Inc.
targeted therapy for cancer; rituximab
The monoclonal antibody rituximab, approved by the U.S. Food and Drug Administration...
Jmol
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