K1 antigen, serotype and antibiotic susceptibility of Escherichia coli isolated from cerebrospinal fluid, blood and other specimens from Japanese infants.
K1 antigens, serotypes and antibiotic susceptibilities of Escherichia coli isolates from neonates and infants were investigated. The presence of K1 antigen was tested by the K1-specific phage method. The number of K1 positive strains was 27 (84%) of 32 isolates from cerebrospinal fluid, 11 (25%) of 44 from blood and 4 (22%) of 18 from other specimens. Fourteen (33%) of the K1 positive strains were serotyped as O16:H6, and 8, 7 and 5 were serotyped as O18ac:H7, O1:H7 and O7:H-, respectively. One of 5 of the K1 negative strains were distributed into 30 different combinations of O and H antigens. The ampicillin resistance rates were 19% in K1 positive strains and 45% in K1 negative ones. The incidence of chloramphenicol resistance was the same in K1 positive and negative strains (21%). Ampicillin resistance was not noted in O16:H6 strains, but the incidence of antibiotic resistance was high (65% to ampicillin and 53% to chloramphenicol) in the rough-type strains.
Fujita
K
K
Department of Pediatrics, Asahikawa Medical College, Japan.
Yoshioka
H
H
Sakata
H
H
Murono
K
K
Kakehashi
H
H
Kaeriyama
M
M
Tsukamoto
T
T
D000942:Antigens, Bacterial / Q000032:analysis*; D000954:Antigens, Surface / Q000032:analysis*; D004926:Escherichia coli / Q000187:drug effects / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007564:Japan; D008826:Microbial Sensitivity Tests
D000942:Antigens, Bacterial; D000954:Antigens, Surface; C030659:K antigens