When Penicillin Was Introduced,how Long Did It Take for Penicillin-Resistant

question 52

Multiple Choice

When penicillin was introduced,how long did it take for penicillin-resistant strains of bacteria to emerge?

• A) 6 months
• B) 1 year
• C) 4 years
• D) 10 years
• E) 25 years

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