Overview There are four different types of influenza viruses: A, B, C and D. The first three are detected in people and animals, but type D has never been transmitted to humans. The flu is easily contagious and can spread …
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Overview There are four different types of influenza viruses: A, B, C and D. The first three are detected in people and animals, but type D has never been transmitted to humans. The flu is easily contagious and can spread …