AAMC 5 Question #142

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It is the only answer that makes sense. 1 is untrue because the first sentence in the passage establishes that no such objects were found in blood. 2 is also incorrect, because that would go against suspecting microbial agents. 3 is the only one that makes sense, and that is the best answer.
 
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I guess I was thinking too much into it. It makes sense to me now if I only think of it in terms of the passage. But I think both viral and microbial diseases are infectious.
 
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