Biology, 18.12.2019 05:31 aljdones

Viruses mutate and can become more pathogenic to humans. some viruses may originate in other animals, such as birds, bats or pigs and then become infectious to humans. an influenza pandemic is a global outbreak of disease that occurs when a new influenza a virus appears or "emerges" in the human population, causes serious illness, and then spreads easily from person to person worldwide. such a

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Viruses mutate and can become more pathogenic to humans. some viruses may originate in other animals...