Genetic characteristics and clonal dissemination of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae strains isolated from the upper respiratory tract of patients in Japan.

Genetic characteristics and clonal dissemination of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae strains isolated from the upper respiratory tract of patients in Japan. Research Abstract Details 

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Genetic characteristics and clonal dissemination of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae strains isolated from the upper respiratory tract of patients in Japan. Abstract Text:

Muneki Hotomi,Keiji Fujihara,Dewan S Billal,Kenji Suzuki,Tadao Nishimura,Shunkichi Baba,Noboru Yamanaka,Muneki Hotomi,Keiji Fujihara,Dewan S Billal,Kenji Suzuki,Tadao Nishimura,Shunkichi Baba,Noboru Yamanaka,

We evaluated the recent prevalence of antimicrobial-resistant Haemophilus influenzae isolated from the upper respiratory tracts (URT) of patients in Japan. Mutations in the ftsI gene, which encodes penicillin binding protein 3 (PBP3), and the clonal dissemination of the resistant strains were also investigated. A total of 264 H. influenzae isolates were collected from patients with URT infections. According to the criteria of the Clinical and Laboratory Standards Institute for the susceptibility of H. influenzae to ampicillin (AMP), the isolates were distributed as follows: 161 (61.0%) susceptible strains (MIC < or = 1 microg/ml), 37 (14.0%) intermediately resistant strains (MIC = 2 microg/ml), and 66 (25.0%) resistant strains (MIC > or = 4 microg/ml). According to PCR-based genotyping, 172 (65.1%) of the isolates had mutations in the ftsI gene and were negative for the beta-lactamase (bla) gene. These 172 isolates were thus defined as genetically beta-lactamase-negative ampicillin-resistant (gBLNAR) strains. The ftsI mutant group included 98 (37.1%) strains with group I/II mutations in the variable mutated region (group I/II gBLNAR) and 74 (28.0%) strains with group III mutations in the highly mutated region (group III gBLNAR). Eighty-seven (33.0%) of the isolates were genetically beta-lactamase-negative ampicillin-susceptible (gBLNAS) strains. The group III gBLNAR strains showed resistance to beta-lactams. Only five strains (1.9%) were positive for a bla gene encoding TEM-type beta-lactamase. The three clusters consisting of 16 strains found among the 61 BLNAR strains (MIC > or = 4 microg/ml and without the bla gene) showed identical or closely related DNA restriction fragment patterns. Those isolates were frequently identified among strains with a MIC to AMP of 16 microg/ml. The current study demonstrates the apparent dissemination and spread of a resistant clone of H. influenzae among medical centers in Japan. The gBLNAR strains show a remarkable prevalence among H. influenzae isolates, with the prevalence increasing with time. This fact should be taken into account when treating URT infections.

Genetic characteristics and clonal dissemination of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae strains isolated from the upper respiratory tract of patients in Japan. Publishing Authors By Initials

M Hotomi,K Fujihara,DS Billal,K Suzuki,T Nishimura,S Baba,N Yamanaka,M Hotomi,K Fujihara,DS Billal,K Suzuki,T Nishimura,S Baba,N Yamanaka,

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Genetic characteristics and clonal dissemination of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae strains isolated from the upper respiratory tract of patients in Japan. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Antimicrobial agents and chemotherapy

VOLUME: 51

Page Numbers: 3969-76

Journal Abbreviation: Antimicrob. Agents Chemother.

ISSN: 0066-4804

DAY: 13

MONTH: 08

YEAR: 2007

Genetic characteristics and clonal dissemination of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae strains isolated from the upper respiratory tract of patients in Japan. Information

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LANGUAGE: eng

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Genetic characteristics and clonal dissemination of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae strains isolated from the upper respiratory tract of patients in Japan. Keywords Mesh Terms:

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AFFILIATION: Department of Otolaryngology-Head and Neck Surgery, Wakayama Medical University, 811-1 Kimiidera, Wakayama-shi, Wakayama, 641-8509, Japan.

Country: United States

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MEDLINETA: Antimicrob Agents Chemother

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