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all infectious diseases: a) are contagious b) only occur in humans c) are caused by microorganisms or their products d) are caused by vectors e) involve viruses as the pathogen
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all infectious diseases: a) are contagious b) only occur in humans c) are caused by microorganisms or their products d) are caused by vectors e) involve viruses as the pathogen

User Denys Wessels
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Answer:answer is A

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User Dave Reid
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