Theriogenology : Prevalence of porcine reproductive and respiratory syndrome virus detection in aborted fetuses, mummified fetuses and stillborn piglets using quantitative polymerase chain reaction

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  • OLANRATMANEE Em-on
    Faculty of Veterinary Medicine, Rajamangala University of Technology Tawan-ok, Chonburi 20110, Thailand
  • WONGYANIN Piya
    Department of Medical Technology, Faculty of Science and Technology, Bansomdejchaopraya Rajabhat University, Bangkok 10600, Thailand
  • THANAWONGNUWECH Roongroje
    Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand
  • TUMMARUK Padet
    Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand

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  • Prevalence of porcine reproductive and respiratory syndrome virus detection in aborted fetuses, mummified fetuses and stillborn piglets using quantitative polymerase chain reaction

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The objective of the present study was to investigate the prevalence of porcine reproductive and respiratory syndrome (PRRS) virus detection in aborted fetuses (n=32), mummified fetuses (n=30) and stillborn piglets (n=27) from 10 swine herds in Thailand using quantitative polymerase chain reaction (qPCR). Pooled organs and umbilical cord from each fetus/piglet were homogenized and subjected to RNA extraction and cDNA synthesis. The qPCR was carried out on the ORF7 of the PRRS viral genome using fluorogenic probes for amplified product detection. The results revealed that 67.4% (60/89) of the specimens contained PRRS virus. The virus was found in 65.6% (21/32) of aborted fetuses, 63.3% (19/30) of mummified fetuses and 74.1% (20/27) of stillborn piglets (P=0.664). Genotype 1, genotype 2 and mixed genotypes of PRRS virus were detected in 19.1% (17/89), 25.8% (23/89) and 22.5% (20/89) of the specimens, respectively (P=0.316). PRRS virus antigen was retrieved from both non-PRRS-vaccinated herds (68.2%, 45/66) and PRRS-vaccinated herds (65.2%, 15/23) (P=0.794). These findings indicated that these specimens are important sources of the PRRS viral load and the viral shedding within the herd. Thus, intensive care on the routine management of dead fetuses and stillborn piglets in PRRS virus-positive herds should be emphasized.

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