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Bulletin No. 26 - Fall 2006
VirologyPMWS-PCV2-PCVD-PDNS
GERARD C
L'AFSSA démontre le rôle du circovirus sur les troubles de la reproduction [French Food Safety Agency (AFSSA) demonstrates the role of circovirus in sow reproduction disorders].
Réussir Porc, 2006, 123, 42-45
Several important points regarding PCV2 are reported:
- The effects of PCV2 on sows and their offspring depends on the infection route. Inoculation of PCV2 by the tracheal or the muscular route induces hyperthermia responsible of abortion, mummification and stillbirth but nor PCV2, PCV2 antibodies nor PCV2-associated lesions are detected in the fetuses. By contrast, intrauterine inoculation of PCV2 does not really impair the general health status of sows but fetuses (viable, mummified and stillborn) are heavily affected by the effect of PCV2 with typical lesions and PCV2 infection.
- Vaccination against parvovirus provides some protection against PCV2 infection: no significant difference in reproductive disorders was observed between vaccinated PCV2-infected sows and PCV2-non-infected sows. Moreover, piglets born of vaccinated PCV2-infected sows showed lower PCV2 titers. An inadequate parvovirus vaccination is thus a risk factor for PMWS. In addition, PCV2-infected newborn piglets should always have an intake of colostral PCV2-antibodies in order to minimize the risks of spread of PCV2 to non-infected piglets. In a context of PCV2 circulation, particular care should thus be taken when making adoptions.
