Potentially hazardous Streptococcus suis strains latent in asymptomatic pigs in a major swine production area of Thailand.
J Med Microbiol
; 66(5): 662-669, 2017 May.
Article
em En
| MEDLINE
| ID: mdl-28516843
ABSTRACT
PURPOSE:
Carrier pigs have been considered as the major reservoir of Streptococcus suis and couldbe a significant source of human infection. Therefore, we investigated the prevalence and characteristics of latent S. suis in asymptomatic pigs in the pig-farming area of central Thailand, and compared the data to those previously reported in other regions.METHODOLOGY:
We collected samples from 340 asymptomatic pigs. S. suis isolates from the samples were confirmed by species-specific PCR (recN PCR). The capsular polysaccharide synthesis gene (cps) types, virulence-associated gene profiles and sequence types (STs) of the isolates were investigated.Results/Key findings. The prevalence of S. suis found in this study was 37â% (125/340 pigs). The most prevalent genotype was mrp-/epf-/sly-. Among the 16 cps-types identified in 135 isolates, cps-type 16 was the most frequent (11â%), whereas 44â% of the isolates were non-typable. In common with the strains causing human sepsis in Thailand, two cps-type 9 isolates and a cps-type 24 isolate from slaughtered pigs belonged to ST16 and ST221, respectively. All the isolated cps-type 2 strains were confirmed as serotype 2 by co-agglutination tests, and these belonged to ST104, the unique ST commonly found in Thai patients; however, in contrast to the endemic areas, the prevalence of serotype 2 strains was relatively low (2â%) and no ST1 isolate was found.CONCLUSION:
Our results showed the population structure differences between S. suis in central Thailand and other regions; however, zoonotic S. suis is certainly latent in asymptomatic pigs in this intensive swine production area.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Infecções Estreptocócicas
/
Doenças dos Suínos
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Streptococcus suis
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Infecções Assintomáticas
Tipo de estudo:
Prevalence_studies
/
Prognostic_studies
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Risk_factors_studies
Limite:
Animals
País/Região como assunto:
Asia
Idioma:
En
Revista:
J Med Microbiol
Ano de publicação:
2017
Tipo de documento:
Article