Penicillin-resistant bacteria
Bacteria that are unaffected by penicillin. Such organisms can sometimes be killed using sulfa drugs, combinations of several medications, or other tactics, but some resistant infections cannot be treated successfully. The rise of penicillin-resistant bacteria is laid to overuse of penicillin drugs, including their ineffective but nonetheless frequent use against colds and other viral infections.

Medical dictionary. 2011.

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