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        Detection of porcine reproductive and respiratory syndrome virus in oral fluid from naturally infected pigs in a breeding herd

        Nguyen Thi Trang,Takuya Hirai,Tsukasa Yamamoto,Mari Matsuda,Naoko Okumura,Nguyen Thi Huong Giang,Nguyen Thi Lan,Ryoji Yamaguchi 대한수의학회 2014 JOURNAL OF VETERINARY SCIENCE Vol.15 No.3

        The objectives of the present study were to evaluate theanatomic localization of porcine reproductive andrespiratory syndrome virus (PRRSV) in naturally infectedpigs and to determine whether oral fluid could be used todetect the virus in infected animals. Two sows, seven2-month-old grower pigs, and 70 6-month-old gilts wereincluded in this study. PRRSV in sera and oral fluid wereidentified by nested reverse transcription PCR (nRT-PCR)while lung, tonsil, and tissue associated with oral cavity weresubjected to nRT-PCR, immunohistochemistry, and in situhybridization. In sows, PRRSV was identified in oral fluidand tonsils. PRRSV was also detected in oral fluid, tonsils,salivary glands, oral mucosa, and lungs of all seven growerpigs. However, viremia was observed in only two growerpigs. Double staining revealed that PRRSV was distributedin macrophages within and adjacent to the tonsillar cryptepithelium. In gilts, the North American type PRRSV fieldstrain was detected 3 to 8 weeks after introducing theseanimals onto the farm. These results confirm previousfindings that PRRSV primarily replicates in tonsils and isthen shed into oral fluid. Therefore, oral fluid sampling maybe effective for the surveillance of PRRSV in breeding herds.

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