PRRSV favours the appearance of secondary infections like the one caused by S. suis due to the impairment of the alveolar macrophages cleaning functions.
From lab to field
Surrounding holdings with high hedge fences reduces the risk of airborne transmission.
PRRSV does not favour infection by H. parasuis by reducing the population of alveolar macrophages, but by reducing their ability to inactivate the bacteria.
App control is an essential link to control pleuroneumonia in PRRS-positive herds.
PRRS virus infection can be considered common in areas of high pig density and, in such cases, the idea that biosecurity and can do little is widespread. However, proper biosecurity measures must be implemented in order to prevent the introduction of new strains.
This article proves that, at least "in vitro" order matters. In PRRSV/PCV2 mixed infections, the consequences are worse when PRRSV infection occurs before or concurrently to PCV2 infection, than when the sequence is reversed.
Since a vast majority of commercial farms are endemically infected with M. hyopneumoniae, the control measures applied against PRRS should include measures against M. hyopneumoniae.