publicações A comparison of the three serological methods for the detection of maternally derived infectious bursal disease (IBD) antibody and their correlation with susceptibility to challenge with IBD virus Documento PRELIMINARY STUDIES ON AN ENZYME-LINKED IMMUNOSORBENT ASSAY TO PORCINE PARVOVIRUS IN PIG SERA. Documento Studies of the specificity of the antibody responses of chickens to inactivated vaccines against infectious bronchitis, based on the haemagglutination inhibition test Documento