Seroprevalence of avian influenza virus and its relationship with increased mortality and decreasedegg production

To evaluate the occurrence of avian influenza viruses (AIV) infections in southern Pakistan, an enzyme-linkedimmunosorbent assay was initially used to screen sera from broiler, layer and broiler breeder flocks for thepresence of antibodies to type A influenza viruses. Data from this survey showed high levels of AIV antibodies,indicating unrecognized AIV infection occurring in these flocks. Based on this information a secondinvestigation was...