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18. Viruses, Viroids, & Prions - Part 1 of 3

18. Viruses, Viroids, & Prions / Introduction to Viruses / Problem 1

Which of the following factors makes it difficult to determine the cause of viral infections?

A

Viruses cannot be easily observed in host tissues.

B

Viruses cannot be cultured readily for inoculation into a new host.

C

Viruses are specific for their hosts and cells.

D

All of the above.

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