The PRRS was previously (last 3 years) diagnosed on the
herd by ELISA and PCR techniques, similar to the reported on
the present paper. Reproductive and respiratory symptoms were
also present. The farm simultaneously monitored serum antibodies
profiles concerning Circov´ırus (PCV K2- IgM and IgG),
Actinobacillus pleuropneumoniae (APP ApxII/TBp 2), Influenza
and Aujeszky disease virus (ADV gB and ADV gE) from sentinels
on each production cycle, i.e., the same 4 to 6 pigs were
periodically prospected at different times.