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Microbiology, 2021

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668 16 • Disease and Epidemiology<br />

through direct or indirect contact with avian influenza virus A shed in the birds’ saliva, mucous, and feces.<br />

Figure 16.12<br />

(a) A mechanical vector carries a pathogen on its body from one host to another, not as an infection. (b) A biological vector<br />

carries a pathogen from one host to another after becoming infected itself.<br />

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