Why is the effectiveness of anti-viral drugs likely to decrease over time?

Question:

Why is the effectiveness of anti-viral drugs likely to decrease over time?

IVirus:

A virus is an infectious agent that attacks a cell or living organism. There are certain sets of cells that different viruses attack and then begin to spread throughout the body. Some viruses enter a host and stay dormant until they triggered to cause an infection.

Answer and Explanation:

The effectiveness of anti-viral drugs is likely to decrease over time because of their ability to mutate in order to develop a resistant to the drug....

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The Life Cycle of a Virus: How Viruses Live, Attack & Replicate

from Biology 103: Microbiology

Chapter 4 / Lesson 3
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