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- W2003067697 abstract "This study was to investigate dynamic and evolution of PRRSV in a seed-stock farm by monitoring PRRSV status from 11 June 2009 to 4 August 2010. For laboratory test, around 18–24 umbilical cords from farrowed sows and 5–95 sera from nursery and grow/finish pigs were submitted around every 2 weeks interval during the study. The submitted samples were tested for PRRSV using IDEXX PRRS 2XR ELISA kit, RT-nested PCR. The PRRSV-positive samples were further sequences based on ORF5 and analyzed using MEGA 3.1 program and Beast 1.5.4 package. The surveyed farm was first infected with type II PRRSV but it was infected newly with type I PRRSV of unknown origin, showing rapid substitution to type I PRRSV as a dominant strain in 2 weeks. The type I PRRSV was first detected from umbilical cord of a farrowed sow in 12 January 2010, and secondly from nursery pigs in 26 January 2010. Although sudden increase of mean S/P ratio was found in grow/finish pigs around 2 months earlier than first type I PRRSV detection, no type I PRRSV viremia was found. Thirty three ORF5 full sequences from 14 type II to 19 type I PRRSVs were obtained chronologically in this farm and the genetic characteristics and evolution rates of those sequences were analyzed. The substitution rates (/site/day) of two types were 4.03 × 10−5 (type I), 3.09 × 10−5 (type II), respectively, which was more frequent than previous reports. The calculated divergence time of type I PRRSV was consistent with the time when the sudden elevation of serum IgG in grow/finish barn was first observed. This study provided fundamental data for type I PRRSV dynamic in a previously type II PRRSV-infected farm and suggested grow/finisher barn could be a primary site for PRRSV introduction." @default.
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- W2003067697 date "2011-06-01" @default.
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- W2003067697 title "One year's study of dynamic and evolution of types I and II PRRSV in a swine farm" @default.
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- W2003067697 doi "https://doi.org/10.1016/j.vetmic.2011.01.025" @default.
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