Carrier status of Streptococcus suis in the palatine tonsils of apparently healthy slaughtered pigs of India

Streptococcus suis is an emerging bacterial pathogen of huge economic impact to the swine industry worldwide. The information regarding the carrier status of S. suis in the slaughtered pigs along with its genetic characterization is not available in Indian pig population, which needs to be addressed...

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Published in:Journal of immunoassay & immunochemistry 2022-09, Vol.43 (5), p.557-578
Main Authors: K.V, Vishva, Gangwar, Pradeep, Chaturji Thakor, Jigarji, Dinesh, Murali, Sahoo, Monalisa, Singh, Rajendra, Mahajan, Sonalika, Qureshi, Salauddin, Laddika, Lahari, Ranjan Sahoo, Nihar, K. De, Ujjawal
Format: Article
Language:English
Subjects:
Animal populations
Antigens
Carrier pigs
Deoxyribonucleic acid
DNA
Economic impact
Genotypes
Health risks
Hogs
immunohistochemistry
Impact analysis
Meningitis
multiplex PCR
palatine tonsil
pathology
S. suis
Septicemia
Serotypes
Streptococcus suis
Swine
Tonsil
virulence genes
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Summary:Streptococcus suis is an emerging bacterial pathogen of huge economic impact to the swine industry worldwide. The information regarding the carrier status of S. suis in the slaughtered pigs along with its genetic characterization is not available in Indian pig population, which needs to be addressed for the therapeutic and preventive measures. In the present study, 563 palatine tonsils of apparently healthy slaughtered pigs were probed for the prevalence, and genetic characterization of S. suis and prevalence were found to be 15.45% and 32.68% by bacteriological and molecular methods, respectively. In 87 isolates recovered, 6 cps-types were detected showing the predominance of serotype 7 (24.13%) and 5 (18.39%), whereas 11 cps-types were detected in tonsillar DNA involving cps-types 9 (28.26%) and 7 (14.13%) as the major serotypes with arcA + /sly + /epf + /mrp − being the prevalent genotype. The histopathological changes with the immunodetection of S. suis antigen confirmed its persistence in asymptomatic carriers. Of 87 bacterial isolates, 7 isolates (serotypes 7 & 2) were pathogenic to Swiss albino mice showing the classical lesions of meningitis and septicemia. The presence of virulent serotypes of S. suis in healthy slaughtered pigs suggests a great health risk to the people engaged in piggery operations and in-contact pigs.
ISSN:1532-1819
1532-4230
DOI:10.1080/15321819.2022.2048011