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Doctors have fought infections with penicillin for over 50 years. Recently, penicillin has not worked as well as before. Which of the following explanations can account for this observation?
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Doctors have fought infections with penicillin for over 50 years. Recently, penicillin has not worked as well as before. Which of the following explanations can account for this observation?

User Jhonatan Sabadi
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Over the years illnesses have been harder to treat because they mutate and start to develop an immunity to drugs.
User Lhk
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