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Open Access Highly Accessed Research article

Development and application of a SYBR green RT-PCR for first line screening and quantification of porcine sapovirus infection

Axel Mauroy1*, Wim H M Van der Poel2, Renate Hakze-Van der Honing2, Christine Thys1 and Etienne Thiry1

Author Affiliations

1 Veterinary Virology and Animal Viral Diseases, Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium

2 Department of Virology, Central Veterinary Institute, Wageningen University and Research Centre, Lelystad, the Netherlands

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BMC Veterinary Research 2012, 8:193  doi:10.1186/1746-6148-8-193

Published: 17 October 2012

Abstract

Background

Sapoviruses are single stranded positive sense RNA viruses belonging to the family Caliciviridae. The virus is detected in different species including the human and the porcine species as an enteric pathogen causing asymptomatic to symptomatic enteritis. In this study, we report the development of a rapid real time qRT-PCR based on SYBR Green chemistry for the diagnosis of porcine sapovirus infection in swine.

Results

The method allows the detection of porcine sapoviruses and the quantification of the genomic copies present in stool samples. During its development, the diagnostic tool showed good correlation compared with the gold standard conventional RT-PCR and was ten-fold more sensitive. When the method was applied to field samples, porcine noroviruses from genogroup 2 genotype 11b were also detected. The method was also applied to swine samples from the Netherlands that were positive for PoSaV infection. Phylogenetic results obtained from the samples showed that PoSaV sequences were genetically related to the currently described genogroup III, to the proposed genogroup VII and also to the MI-QW19 sequence (close to the human SaV sequences).

Conclusions

A rapid, sensitive, and reliable diagnosis method was developed for porcine sapovirus diagnosis. It correlated with the gold standard conventional RT-PCR. Specificity was good apart for genogroup 2 genotype 11b porcine noroviruses. As a first line screening diagnosis method, it allows a quicker and easier decision on doubtful samples.

Keywords:
Sapovirus; Diagnosis; Real time PCR; Porcine; SYBR green; Phylogeny