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

Question 34

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. What process is the cause of this situation?


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

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