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21. Principles of Disease - Part 1 of 3

21. Principles of Disease / Koch's Postulates / Problem 12

Which of the following best explains why viruses often present a challenge to the first of Koch's postulates?

A

Viruses do not cause diseases.

B

Viruses can only be seen with an electron microscope.

C

Viruses are present in healthy individuals as well as those with disease.

D

Viruses cannot be isolated from host cells.

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