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  • Title: Farm studies of porcine parvovirus infection.
    Author: Cutler RS, Molitor TW, Leman AD, Werdin RE.
    Journal: J Am Vet Med Assoc; 1983 Mar 15; 182(6):592-4. PubMed ID: 6833101.
    Abstract:
    Epizootics of reproductive failure associated with porcine parvovirus infection were investigated on 38 farms. Mummification was common to all epizootics. The mean number of mummified fetuses per affected litter was 3.1. Mean number of pigs born alive for gilts and sows farrowing litters with mummified fetuses was 5.0, but for sows without mummified litters on the same farms it was 9.0. Mummified fetuses were observed in aborted litters on 8 (21.1%) farms. Gilts and sows that appeared pregnant but "lost" their swollen abdomens and failed to farrow were observed on 12 (39.5%) farms. Delayed return to estrus was evident on only 3 (7.9%) farms with a continuous farrowing program. On 21 farms with a batch farrowing program, only 2 (10%) epizootics involved more than 1 batch. Up to 100% of the pregnant swine in the group farrowing together produced mummified pigs, but less than 20% of the breeding herd was affected in 26 (68.4%) cases. The prevalence of disease was not related to herd size, housing, or farrowing management.
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