The antibiotic penicillin in the 40s of the XX century was very effective against Staphylococcus aureus.

The antibiotic penicillin in the 40s of the XX century was very effective against Staphylococcus aureus. Nowadays, even many times large doses of penicillin do not kill this bacterium. How can you explain this fact?

the bacterium has adapted to the antibiotic (driving selection).



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