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J. Med. Microbiol. -- Vol. 49 (2000), 845-847
© 2000 Society for General Microbiology
ISSN 0022-2615

SHORT ARTICLE

Clonal spread of an invasive strain of Haemophilus influenzae type b among nursery contacts accompanied by a high carriage rate of non-disease-associated strains

MITSUMASA SAITO*,{dagger}, KENJI OKADA{dagger}, KOUICHI TAKEMORI{ddagger} and SHIN-ICHI YOSHIDA*

Departments of *Bacteriology and {dagger}Paedriatrics, Graduate School of Medical Sciences, Kyushu University and {ddagger}Department of Clinical Laboratory, Kyushu University Hospital, Fukuoka 812-8582, Japan

Corresponding author: Dr M. Saito (email: msaito{at}bact med.kyushu-u.ac.jp).

Received 9 Aug. 1999; revised version accepted 8 Feb. 2000.

Abstract

Haemophilus influenza carriage was examined in unvaccinated nursery contacts of a patient with H. influenzae type b (Hib) meningitis and isolates were typed by pulsed-field gel electrophoresis (PFGE). Nasopharyngeal isolates were classified into eight PFGE patterns. Seven Hib carriers were found among 15 nursery contacts. The isolates from the carriers showed a PFGE pattern identical to that of the meningitis strain. The carrier rate of non-disease-associated strains was also high (47%, 7 of 15). This study suggests that the clonal spread of invasive (serotype b) H. influenzae strains is accompanied by a high carriage rate of non-disease-associated strains.




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