In 9 weeks old piglets, there are severe respiratory symptoms and typical necropsy findings of Glässer’s disease. We also detected a high level of PRRSv viremia in the piglet group. In this situation, will the PRRSv piglet vaccination helpful to solve respiratory problems? Should we consider the HPS vaccine together with the PRRS vaccine?
PRRS circulation in the nurseries are often associated with secondary bacteria, and the most common ones are those producing polyserositis (G. parasuis, S.suis or M. hyorhinis).
Considerations about PRRS vaccination in piglets
PRRS vaccine can help in these situations, as long as not many pigs are born viremic; in fact the best results are obtained when the piglets are weaned PCR PRRS negative once the infection has been found in the nurseries.
So before using any PRRS vaccine it can be helpful to forecast the results to know in advance what’s the pig PRRS status at birth and at weaning.
Considerations about Glässer’s disease vaccination in piglets
Concerning G.parasuis vaccine, it can help when used on sows to pass stronger immunity to offspring.
When disease is seen at 9 weeks, as it is the case, piglet vaccination is difficult, as vaccines required 2 shoots before immunity is developed which means giving the first shoot the latest at weaning when maternal derived antibodies can partially interfere the effect of the vaccine reducing its effectivity.
But, in any case, a good diagnosis have to be done first to know what is the etiological agent of the polyserositis as often can be S.suis or M.hyorhinis and in those cases HPS vaccine will not be useful.
If you want to know more about concurrent infections with other pathogens in PRRS virus infections under field conditions, visit “Concurrent infections“.
Marcovetgrup S.L. – Spain