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J Med Microbiol 58 (2009), 1508-1513; DOI: 10.1099/jmm.0.013656-0
© 2009 Society for General Microbiology
ISSN 0022-2615

Clonal dissemination of human isolates of Streptococcus suis serotype 14 in Thailand

Anusak Kerdsin1, Kazunori Oishi2, Saowalak Sripakdee1, Nitsara Boonkerd1,3, Pitimol Polwichai1, Shota Nakamura4, Ryuichi Uchida4, Pathom Sawanpanyalert1 and Surang Dejsirilert1

1 National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Tiwanon Road, Muang, Nonthaburi 11000, Thailand

2 Laboratory for Clinical Research on Infectious Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita 565-0871, Japan

3 Naresuan University, Phitsanulok 65000, Thailand

4 Thailand–Japan Research Collaboration Center for Emerging and Re-Emerging Infections, Department of Medical Sciences, Ministry of Public Health, Tiwanon Road, Muang, Nonthaburi 11000, Thailand

Correspondence
Kazunori Oishi
oishik{at}biken.osaka-u.ac.jp

Received June 19, 2009
Accepted July 31, 2009

Most cases of Streptococcus suis infection in humans are caused by serotype 2 strains, and only a few cases caused by other serotypes have been reported. Among 177 human isolates of S. suis in Thailand, 12 (6.8 %) were identified as being of serotype 14, and an occurrence of sporadic S. suis serotype 14 infection was noted during 2006–2008, particularly in northern Thailand. Clinical presentations of the 12 patients (median age 62.9 years) included meningitis (58.3 %), septic arthritis (25 %) and sepsis (16.7 %). These clinical features were similar to those previously reported for S. suis infections, except that there were no fatal cases. All of the 12 serotype 14 strains belonged to the multilocus sequence types (ST) 105 (n=11) and the novel ST127 (n=1). Molecular typing by PFGE revealed four different pulsotypes, including an identical pattern for nine ST105 strains and three closely related patterns for two ST105 strains and one ST127 strain. Our PFGE data suggested clonal dissemination of ST105 strains in Thailand. Because serotype 14 is becoming a more common cause of S. suis infections in humans, diagnostic tests for serotype 14 should be performed in South-East Asian countries.






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