The influenza viruses that infect man usually are derived from a type that could also infect:

Name: The influenza viruses that infect man usually are derived from a type that could also infect:
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Influenza viruses that infect humans are usually derived from viruses that infect birds and pigs, making option D the correct choice. While there have been cases of influenza viruses crossing over from other animals such as horses, the primary source for human influenza viruses is birds and pigs.

The Influenza Viruses That Infect Man Usually Are Derived from a Type