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https://hdl.handle.net/1959.11/22891
Title: | Perfil sorológico, viremia e eliminação do circovírus suíno tipo 2 em animais naturalmente infectados pertencentes a granjas com ou sem a síndrome da refugagem multissistêmica | English Title: | Serological profile, viremia and PCV2 shedding in naturally infected pigs of herds with or without postweaning multisystemic wasting syndrome | Contributor(s): | Pinto, Flavia F (author); Gerber, Priscilla Freitas (author) ; Oliveira, Tulia M L (author); Borges, Iara A (author); Lobato, Zelia I P (author) | Publication Date: | 2011 | Open Access: | Yes | DOI: | 10.1590/s0100-736x2011000100003 | Handle Link: | https://hdl.handle.net/1959.11/22891 | Publication Type: | Journal Article | Source of Publication: | Pesquisa Veterinária Brasileira, 31(1), p. 17-22 | Publisher: | Colegio Brasileiro de Patologia Animal | Place of Publication: | Brazil | ISSN: | 1678-5150 0100-736X |
Fields of Research (FoR) 2008: | 070704 Veterinary Epidemiology 070712 Veterinary Virology 070705 Veterinary Immunology |
Socio-Economic Objective (SEO) 2008: | 830308 Pigs | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal | English Abstract: | A virological and serological cross-sectional study (E1) and a longitudinal study (E2) were performed on herds with (G2 and G3) and without (G1) post weaning multisystemic syndrome (PMWS) in Brazil. Blood, serum, nasal and rectal swabs samples were collected of sows, farrowing piglets, nursery, growing and finishing pigs. In E1, were sampled 40 animals in each category (G1a and G2). In E2, (G1b and G3), 35 farrowing piglets were identified and sampled along the production cycle. Porcine circovirus type 2 (PCV2) antibodies were assayed. A PCR was used to detected PCV2 genome in blood and swabs. In E1, sows had high rates of viremic and seropositives animals, with percentage of sows with high antibodies titers greater than G2. Passive antibodies decline occurred between nursery and growing area with increased viral shedding in swabs and subsequent seroconversion in G1. In G2, the passive antibodies decay occurred in nursery, with a reduction in viral shedding. In E2, the decline of maternal immunity occurred between the 1st and 2nd collection in G1b, and between 2nd and 3rd collections in G3. In both herds, the decay of passive immunity coincided with increased viremia and viral shedding; and seroconversion occurred between the 3rd and 4th collection in both herds with decline of viremia. Viremia and viral shedding was detected in all samples days, 42% of animals sampled in E2 were viremic and all tissue samples collected at slaughter were positive for PCV2. This study confirms the persistence of viremia even in the presence of high titers of antibodies and the serological profile in a herd with or without PMWS may be different, especially with regard to the passive immunity duration. |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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