Which discovery marks the start of modern antibiotics?The discovery of（）marks the start of modern antibiotics.

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• Antibiotics are administered to patients after surgery, even if no signs or symptoms of infection are present, in order to preve
• About 5000 antibiotics have been isolated from（）, but of these only fewer than 100 are in therapeutic use.
• About 5000 antibiotics have already been isolated from microorganisms.
• Penicillin antibiotics were among the first medications to be effective against many bacterial infections caused by staphylococc
• Penicillin is a group of antibiotics which include（）, Penicillin V, procaine penicillin and benzathine penicillin.