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Retroviremia in commercial pigs and its preliminary association with poor health

Retroviremia in commercial pigs and its preliminary association with poor health

Journal of Clinical Microbiology 44(10): 3846-3847

In this study, 87 sera of pigs from different pig farms were analysed for porcine endogenous retroviruses (PERV) RNA. The samples originated from 4 distinct pig farms: farm 1, a specific pathogen-free colony of Danish-Ellegaard minipigs free from porcine reproductive and respiratory syndrome virus (PRRSV) and postweaning multisystemic wasting syndrome (PMWS); farm 2, a UK Large White cross herd free from PRRSV and PMWS; farm 3, a UK Large White cross herd positive for PRRSV and PMWS; and farm 4, a Spanish Large White cross herd negative for PRRSV and PMWS. Results showed that serum-associated PERV RNA was detected in all but one (86/87) of the serum samples (range, 0-5.74x106 copies/ml serum). A univariate analysis of variance indicated significant differences in PERV RNA serum titre with respect to farm of origin and age of pig sampled. There was also a strong evidence of an interaction between farm of origin and age. Overall, there was a tendency for increased levels of serum viral RNA in pigs aged <2 months. Taking into account the farm of origin, levels of serum viral RNA were significantly greater for animals on farm 3, versus levels for animals on farms 1 and 2. In contrast, animals on farm 4 exhibited higher titres of viral RNA only in the postweaning age group. These data support the existence of retroviraemia in the examined pigs.

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Accession: 012816991

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PMID: 17021127

DOI: 10.1128/jcm.01378-06

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