62. What type of microorganism causes the flu?
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The flu is caused by an influenza virus. Most people get the flu when they breathe in airborne droplets from a cough or sneeze of someone who has the flu.
There are four types of influenza viruses: A, B, C, and D. Human influenza A and B viruses cause a seasonal epidemic of illness (known as influenza season) almost every winter in the United States.
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