Serotypes of Streptococcus suis isolated from healthy pigs in Phayao Province, Thailand. (December 2017)

• Record Type: Journal Article
• Authors: Thongkamkoon, P.; Kiatyingangsulee, T.; Gottschalk, M.
• Is Part Of: BMC research notes. Volume 10:Number 1(2017)
• Page Start: 1
• Page End: 7
• Publication Date: 2017-12
• Subjects: Streptococcus suis -- Serotypes -- Tonsil -- Pigs -- Phayao Province; Medicine -- Periodicals; Biology -- Periodicals; 610.5
• DOI: 10.1186/s13104-016-2354-2
• Languages: English
• ISSNs: 1756-0500

Abstract

Abstract Background Streptococcus suis (S. suis ) is an important swine and human pathogen. There are 33 serotypes that have been described. Zoonotic cases are very common the Northern part of Thailand, especially in Phayao Province. However, the prevalence ofS. suis and, more particularly the different serotypes, in pigs in this region is poorly known and needed to be addressed. The context and purpose of the study Distribution ofS. suis serotypes varies depending on the geographical area. Knowledge of the serotype distribution is important for epidemiological studies. Consequently, 180 tonsil samples from slaughterhouse pigs in Phayao Province had been collected for surveillance, from which 196S. suis isolates were recovered. Each isolate was subcultured and its serotype identified using multiplex PCR. Slide agglutination combined with precipitation tests were used following multiplex PCR to differentiate the isolates showing similar sizes of amplified products specific to either serotype 1 or 14 and 2 or 1/2. Non-typable isolates by multiplex PCR were serotyped by the coagglutination test. Results Of the 196 isolates, 123 (62.8%) were typable and 73 (37.2%) were non-typable. This study revealed the presence of serotypes 1, 1/2, 2, 3, 4, 5, 7, 9, 11, 12, 13, 14, 21, 22, 23, 24, 25, 29, and 30. Serotype 23 was the most prevalent (20/196, 10.2%), followed by serotype 9 (16/196, 8.2%), serotype 7 (16/196, 8.2%), and serotype 2 (11/196, 5.6%). The latter is the serotype responsible for most human cases. Conclusion Almost all serotypes previously described are present in Northern Thailand. Therefore, this report provides useful data for future bacteriological studies.