In a PRRS-free farm, we vaccinated 10% of the sows with a live vaccine against PRRS by mistake. What are the possible consequences?

Answered by: Enric Marco
Published on: June 6, 2016

The application of a live vaccine may lead to a certain spread of the virus among the animals in the farm, so the virus might be temporarily circulating in the herd. However, because the vaccine virus is an attenuated virus, it is not going to give clinical problems that threaten the productivity of the farm.
The persistence of vaccine viruses in a population has not been sufficiently studied, but it should be lower than that of the wild virus.
Should the virus come to spread in the herd, then negative herd status should be recovered after a certain period of time without intervention.

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