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In 1980, Only 1% to 5% of All Staphylococcus Aureus

Question 71

Multiple Choice

In 1980, only 1% to 5% of all Staphylococcus aureus isolates were MRSA strains. Now 60% to 70% of S. aureus isolates are MRSA strains. This is an example of


A) stabilizing selection of humans.
B) directional selection of humans.
C) directional selection of bacteria.
D) diversifying selection of bacteria.

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