All strains of influenza virus that infect humans originally came from strains that infected non-human animals, most commonly ... Birds Cattle Chimpanzees Monkeys
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Step 1: Understand the question The question is asking about the origin of human influenza viruses and the most common non-human animal source from which these strains originally came. Show more…
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To cause a human pandemic, the H5N1 avian flu virus would have to a. spread to primates such as chimpanzees. b. develop into a virus with a different host range. c. become capable of human-to-human transmission. d. become much more pathogenic.
$\begin{equation} \begin{array}{l}{\text { To cause a human pandemic, the H5N1 avian flu virus would }} \\ {\text { have to }} \\ {\text { (A) spread to primates such as chimpanzees. }} \\ {\text { (B) develop into a virus with a different host range. }} \\ {\text { (C) become capable of human-to-human transmission. }} \\ {\text { (D) become much more pathogenic. }}\end{array} \end{equation}$
Viruses are able to infect: a) humans. b) plants. c) bacteria. d) birds e) All of the above.
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