title: Ampicillin susceptibilities of vaginal and placental isolates of group B streptococcus and Escherichia coli obtained between 1992 and 1994.
abstract: Vaginal group B streptococcus (GBS) and Escherichia coli isolates were tested for their susceptibilities to ampicillin. All 414 GBS isolates tested were susceptible to ampicillin; the MIC at which 90% of the isolates were inhibited (MIC90) was 0.125 microg/ml, and the range was 0.06 to 0.25 microg/ml. The MIC50 for the 342 E. coli isolates tested was 4.0 microg/ml, and 27% were resistant to ampicillin.
authors.affiliation: Magee-Womens Research Institute, Pittsburgh, Pennsylvania 15213, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Meyn
authors.forename: S L
authors.initials: SL
authors.lastname: Hillier
mesh_terms: D000328:Adult; D000667:Ampicillin / Q000494:pharmacology*; D000668:Ampicillin Resistance; D004926:Escherichia coli / Q000187:drug effects* / Q000302:isolation & purification; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008826:Microbial Sensitivity Tests; D010406:Penicillins / Q000494:pharmacology*; D010920:Placenta / Q000382:microbiology*; D013292:Streptococcus agalactiae / Q000187:drug effects* / Q000302:isolation & purification; D014621:Vagina / Q000382:microbiology*
chemical_list: D010406:Penicillins; D000667:Ampicillin