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• a  unaffected by penicillin
  penicillin-resistant bacteria

• Scientists fear that introducing massive amounts of penicillin into the general population could hasten the creation of mutant penicillin-resistant strains of bacteria.
• What makes the report especially disturbing is that the drug in question is a quinolone--one of a family of antibiotics that, with the spread of penicillin-resistant superbugs .
• About 15,000 Olongapo residents are registered "bar girls," many of them infected with a penicillin-resistant strain of gonorrhea known as "Viet Nam Rose.