Farrowing room transmission of PCV2 from sows to piglets
Infection of pigs occurs at birth but maternal immunity suppresses viremic infection in growing pigs until immunity wanes around 10 weeks of age, when a hidden infection re-appears.
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Infection of pigs occurs at birth but maternal immunity suppresses viremic infection in growing pigs until immunity wanes around 10 weeks of age, when a hidden infection re-appears.
PCV2 vaccination is nearly universal. Has viral presence decreased after 6 years of vaccination? Could vaccination policies be changed?
The decrease in PCV2a and PCV2b genotypes over time and the increase in PCV2d in 2012 may be due more to other, unknown, factors than to immunological selection resulting from PCV2a-based vaccination.