Antimicrobial susceptibilities and serotypes of Streptococcus pneumoniae in southwestern Japan and correlation of penicillin-binding protein 2b and 2x mutations in susceptibilities of penicillin G and cefotaxime.
MICs of penicillin G and other drugs and serotypes were determined for 218 strains of Streptococcus pneumoniae isolated from children in southwestern Japan. Twenty-one (9.6%) and 81 (37.2%) isolates were penicillin-resistant (MIC >/=2.0 microg/ml) and intermediate (MIC 0.13-1.0 microg/ml), respectively. Panipenem was most active parenteral agent against penicillin-intermediate (MIC(90) 0.125 microg/ml) and -resistant strains (MIC(90) 0.25 microg/ml). Among oral beta-lactam agents, cefditoren had good activity against penicillin-intermediate and resistant strains (MIC(90) 0.5/1.0 microg/ml). Serogroup 6 was the most prevalent (65/218) among all strains and 19F (44 strains) was the most prevalent among penicillin-intermediate and -resistant strains. Both pbp2b resistant and susceptible genes were found in penicillin-intermediate strains. Pbp2x resistant genes were found in 33 of 80 (41.3%) cefotaxime-susceptible strains. These results suggest that possible resistance mechanisms may occur even in drug susceptible strains and that drug susceptibility survey should be updated carefully in Japan.
Nagai
K
K
Department of Pediatrics and Child Health, Kurume University School of Medicine, 67-Asahimachi, 830-0011, Kurume, Fukuoka, Japan. kxn13@psu.edu
Matsuo
Y
Y
Tsumura
N
N
Sakata
Y
Y
Kato
H
H
D019881:Aminoacyltransferases; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001426:Bacterial Proteins; D002352:Carrier Proteins / Q000235:genetics; D002439:Cefotaxime / Q000494:pharmacology*; D018550:Cephalosporin Resistance / Q000235:genetics; D002511:Cephalosporins / Q000494:pharmacology; D002648:Child; D002675:Child, Preschool; D006602:Hexosyltransferases; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007564:Japan; D008826:Microbial Sensitivity Tests; D002267:Muramoylpentapeptide Carboxypeptidase / Q000235:genetics; D009154:Mutation; D010400:Penicillin G / Q000494:pharmacology*; D010403:Penicillin Resistance / Q000235:genetics; D046915:Penicillin-Binding Proteins; D010406:Penicillins / Q000494:pharmacology; D010458:Peptidyl Transferases; D011008:Pneumococcal Infections / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D012703:Serotyping; D013296:Streptococcus pneumoniae / Q000145:classification / Q000187:drug effects* / Q000235:genetics
D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D002352:Carrier Proteins; D002511:Cephalosporins; D046915:Penicillin-Binding Proteins; D010406:Penicillins; C072223:PBP 2x protein, Streptococcus; D019881:Aminoacyltransferases; C478701:penicillin-binding protein 2b, Streptococcus; D010458:Peptidyl Transferases; D006602:Hexosyltransferases; D002267:Muramoylpentapeptide Carboxypeptidase; D002439:Cefotaxime; D010400:Penicillin G