C. Betriu et al., ANTIBIOTIC-RESISTANCE AND PENICILLIN TOLERANCE IN CLINICAL ISOLATES OF GROUP-B STREPTOCOCCI, Antimicrobial agents and chemotherapy, 38(9), 1994, pp. 2183-2186
The aim of this study was to determine the susceptibility patterns of
100 group B streptococcal strains isolated in our hospital and to asce
rtain tolerance to penicillin by determining quantitative killing curv
es. We found two strains with intermediate susceptibility to penicilli
n and eight strains to ampicillin. Seventeen isolates were tolerant to
penicillin, with bacterial counts decreasing 2 to 3 log during the fi
rst 8 h but stilt above 10(2) CFU/ml after 24 h. The kinetic study sho
ws that penicillin tolerance is not rare among group B streptococci is
olated in our hospital.