Influenza & Flu Vaccines -- Science Behind The News
Influenza & Flu Vaccines
Every flu season, Americans battle coughs, fevers and body aches. The flu is a respiratory illness caused by a virus, a pathogen that causes disease in the human body. To understand how the flu is caught, spread and treated, Duke University's Katia Koelle explains the biology of a virus and how it is transmitted.
Credit: NBC Learn and the National Science Foundation
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