1. Clonal dissemination of Vibrio parahaemolyticus displaying similar DNA fingerprint but belonging to two different serovars (O3:K6 and O4:K68) in Thailand and India
- Author
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Manas Chongsa-nguan, T. Ramamurthy, Yoshifumi Takeda, Pikul Moolasart, G. Balakrish Nair, Wanpen Chaicumpa, N. R. Chowdhury, Mitsuaki Nishibuchi, S. K. Bhattacharya, Soumen Chakraborty, Rupak Mitra, and Boonchuay Eampokalap
- Subjects
Serotype ,DNA, Bacterial ,Diarrhea ,Epidemiology ,India ,Polymerase Chain Reaction ,Microbiology ,Ribotyping ,Pulsed-field gel electrophoresis ,Humans ,DNA Primers ,Molecular epidemiology ,Phylogenetic tree ,biology ,Vibrio parahaemolyticus ,Incidence ,biology.organism_classification ,Thailand ,DNA Fingerprinting ,Electrophoresis, Gel, Pulsed-Field ,Infectious Diseases ,DNA profiling ,Vibrio Infections ,Restriction fragment length polymorphism ,Polymorphism, Restriction Fragment Length ,Research Article - Abstract
Active surveillance of Vibrio parahaemolyticus infection among hospitalized patients in Calcutta, India, showed the appearance of the O4[ratio ]K68 serovar for the first time in March 1998 alongside the continued predominant incidence of the O3[ratio ]K6 serovar. Strains belonging to both these serovars have been reported to possess pandemic potential. The genomes of O3[ratio ]K6 and O4[ratio ]K68 strains and for comparison, non-O3[ratio ]K6 and non-O4[ratio ]K68 strains isolated from two different countries, India and Thailand, were examined by different molecular techniques to determine their relatedness. The O3[ratio ]K6 and O4[ratio ]K68 strains from Calcutta and Bangkok carried the tdh gene but not the trh gene. Characterization of representative strains of these two serovars by ribotyping and by arbitrarily primed-polymerase chain reaction (AP-PCR) showed that the isolates had identical ribotype and DNA fingerprint. Pulsed-field gel electrophoresis (PFGE) performed with the same set of strains yielded nearly similar restriction fragment length polymorphism (RFLP) patterns for the O3[ratio ]K6 and O4[ratio ]K68 isolates from Calcutta and Thailand. Phylogenetic analysis of the NotI RFLP showed that the O3[ratio ]K6 and O4[ratio ]K68 strains formed a cluster with 78–91% similarity thus indicating close genetic relationship between the two different serovars isolated during the same time-frame but from widely separated geographical regions. The non-O3[ratio ]K6 and non-O4[ratio ]K68, in contrast, showed different ribotype, AP-PCR and PFGE patterns.
- Published
- 2000