title: Letter: Ampicillin resistance in Staphylococci.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology*; D001437:Bacteriuria / Q000382:microbiology; D006801:Humans; D010403:Penicillin Resistance; D013211:Staphylococcus aureus / Q000187:drug effects*
chemical_list: D000667:Ampicillin