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allergen
Table of Contents
Introduction References & Edit History Related Topics
Images & Videos
pollen grains
What does hypoallergenic really mean for consumer products?
Why do people have allergies in the spring?
Why scratching an itch actually makes it worse
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
A Yorkshire terrier dressed up as a veterinarian or doctor on a white background. (dogs)
A Visit with the Word Doctor: Medical Vocabulary Quiz
Related Questions
Read Next
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
Macro Aedes aegypti Mosquito. Close up a Mosquito sucking human blood,
Why Do Mosquito Bites Itch?
People wearing surgical masks (also called face mask or medical masks or safety masks) walk through the city center of Milan, Italy on Feb. 23, 2020. Coronavirus disease COVID-19 pandemic
How Do Face Masks Control the Spread of Disease?
Scanning electron micrograph showing the spiral-shaped bacteria of the genus Leptospira. These organisms cause leptospirosis.
8 Zoonotic Diseases
Scan of human brain
What Are the Symptoms of a Stroke?
Discover
Statue of Liberty in front of the skyline of Manhattan, New York City, New York.
Who Was the Woman Behind the Statue of Liberty?
Several red apples with cut apple in the foreground.
Can Apple Seeds Kill You?
Secret Service Agent Listens To Earpiece
Secret Service Code Names of 11 U.S. Presidents
Community service - volunteers picking up garbage in a park during a spring cleanup. Environmentalism
A Timeline of Environmental History
Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)
All 119 References in “We Didn’t Start the Fire,” Explained
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
Obscure Freaky Smiling Psycho Man, phsychopath, sociopath, evil, mean
What’s the Difference Between a Psychopath and a Sociopath? And How Do Both Differ from Narcissists?

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Videos

What does hypoallergenic really mean for consumer products?
Debunking the claims of hypoallergenic products.
Video: © American Chemical Society (A Britannica Publishing Partner)
Why do people have allergies in the spring?
Learn what allergies are and what causes them.
Video: © American Chemical Society (A Britannica Publishing Partner)
Why scratching an itch actually makes it worse
Understanding the chemical process of itching and why scratching is futile.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

pollen grains
Scanning electron microscopic image of pollen from various common plants.
Dartmouth Electron Microscope Facility, Dartmouth College
VIEW MORE in these related Britannica articles: