Dynamics of porcine circovirus type 2 infection in a herd of pigs with postweaning multisystemic wasting syndrome

Gabriela M. Rodríguez-Arrioja Centre de Recerca en Sanitat Animal, Departament de Sanitat i d'Anatomia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

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Joaquim Segalés Centre de Recerca en Sanitat Animal, Departament de Sanitat i d'Anatomia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

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Maria Calsamiglia Centre de Recerca en Sanitat Animal, Departament de Sanitat i d'Anatomia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

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Ana R. Resendes Centre de Recerca en Sanitat Animal, Departament de Sanitat i d'Anatomia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

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Mònica Balasch Fort Dodge Veterinaria S. A., 17813 Vall de Bianya, Girona, Spain.

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Juan Plana-Durán Fort Dodge Veterinaria S. A., 17813 Vall de Bianya, Girona, Spain.

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Jordi Casal Centre de Recerca en Sanitat Animal, Departament de Sanitat i d'Anatomia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

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Mariano Domingo Centre de Recerca en Sanitat Animal, Departament de Sanitat i d'Anatomia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.

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Abstract

Objective—To determine the pattern of infection for porcine circovirus type 2 (PCV2) in a herd of pigs with postweaning multisystemic wasting syndrome (PMWS).

Animals—29 sows and 250 pigs.

Procedure—Blood samples were collected from all 3-, 7-, and 12-week old pigs and 59 pigs at 28 weeks of age. Pigs that died during the study were necropsied. Porcine parvovirus and PCV2 antibodies were assayed. A polymerase chain reaction (PCR) was used to detect PCV2 genome in serum of selected pigs.

Results—The PMWS started when pigs were 8 weeks old, with a prevalence of 30% in 8- to 10-weekold pigs. Eighty-three pigs died during the period between 3 and 12 weeks of age. Microscopic lesions consistent with PMWS were observed, and PCV2 nucleic acid was detected (50 of 68 pigs). Antibodies to PCV2 decreased from 3 to 7 weeks of age, increased at 12 weeks of age, and were maintained until 28 weeks of age. One sow had a positive result for PCR of serum. Nine, 37, and 8 pigs had PCV2 genome in serum obtained at 7, 12, and 28 weeks of age, respectively.

Conclusions and Clinical Relevance—Infection with PCV2 coincided with severe clinical signs; however, infected 28-week-old pigs did not have evidence of disease. Immunity declined over time in young pigs. A long duration of PCV2 viremia was apparent in a high percentage of infected pigs, which may affect transmission and persistence of the virus in a herd. (Am J Vet Res 2002;63:354–357).

Abstract

Objective—To determine the pattern of infection for porcine circovirus type 2 (PCV2) in a herd of pigs with postweaning multisystemic wasting syndrome (PMWS).

Animals—29 sows and 250 pigs.

Procedure—Blood samples were collected from all 3-, 7-, and 12-week old pigs and 59 pigs at 28 weeks of age. Pigs that died during the study were necropsied. Porcine parvovirus and PCV2 antibodies were assayed. A polymerase chain reaction (PCR) was used to detect PCV2 genome in serum of selected pigs.

Results—The PMWS started when pigs were 8 weeks old, with a prevalence of 30% in 8- to 10-weekold pigs. Eighty-three pigs died during the period between 3 and 12 weeks of age. Microscopic lesions consistent with PMWS were observed, and PCV2 nucleic acid was detected (50 of 68 pigs). Antibodies to PCV2 decreased from 3 to 7 weeks of age, increased at 12 weeks of age, and were maintained until 28 weeks of age. One sow had a positive result for PCR of serum. Nine, 37, and 8 pigs had PCV2 genome in serum obtained at 7, 12, and 28 weeks of age, respectively.

Conclusions and Clinical Relevance—Infection with PCV2 coincided with severe clinical signs; however, infected 28-week-old pigs did not have evidence of disease. Immunity declined over time in young pigs. A long duration of PCV2 viremia was apparent in a high percentage of infected pigs, which may affect transmission and persistence of the virus in a herd. (Am J Vet Res 2002;63:354–357).

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