J Med Microbiol 56 (2007), 608-613; DOI: 10.1099/jmm.0.47006-0
© 2007 Society for General Microbiology
ISSN 1473-5644
The dominance of pandemic serovars of Vibrio parahaemolyticus in expatriates and sporadic cases of diarrhoea in Thailand, and a new emergent serovar (O3 : K46) with pandemic traits
Oralak Serichantalergs1,
Nurul Amin Bhuiyan2,
Gopinath Balakrish Nair2,
Orapan Chivaratanond1,
Apichai Srijan1,
Ladaporn Bodhidatta1,
Sinn Anuras3 and
Carl J. Mason1
1 Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok 10400, Thailand
2 International Centre for Diarrhoeal Disease Research (ICDDR,B), Dhaka 1212, Bangladesh
3 Bumrungrad Hospital, Bangkok 10110, Thailand
Correspondence
Oralak Serichantalergs
oralaks{at}afrims.org
Received 13 October 2006
Accepted 17 January 2007
Vibrio parahaemolyticus is a major cause of gastroenteritis worldwide. A total of 95 V. parahaemolyticus isolates belonging to 23 different serovars were identified in a casecontrol study of expatriates and Thai adults from 2001 to 2002 in Thailand. Fifty-two per cent of isolates (49/95) were resistant to ampicillin and sulfisoxazole, but all isolates were susceptible to ciprofloxacin and trimethoprimsulfamethoxazole, two antibiotics commonly used to treat travellers diarrhoea. All isolates were positive for the species-specific toxR gene, and 91 and 5 were positive for the thermostable direct haemolysin (tdh) gene and the tdh-related (trh) gene, respectively. Sixty-five isolates were assigned to the pandemic group of V. parahaemolyticus by a group-specific PCR and the presence of the orf8 gene. The pandemic isolates belonged to three recognized serovars (O3 : K6, O1 : K25, O1 : KUT) and a new serovar, O3 : K46. This new serovar harboured pandemic traits. PFGE analysis revealed that all pandemic isolates including serovar O3 : K46 were closely related and clearly distinct from the non-pandemic isolates. In summary, three well-known serovars of pandemic V. parahaemolyticus isolates were identified as a major cause of diarrhoea in Thailand and a new V. parahaemolyticus isolate, serovar O3 : K46, with pandemic traits was detected.
Abbreviations: GS, group-specific.
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