Immunological relationship between infectious cough in horses and human influenza A

Summary High CF antibody titers against the soluble (CAM) antigen of influenza A have been demonstrated in a large proportion of sera from horses suffering from an epizootic febrile cough. Significant rises in titers were found in 4 out of 5 cases in which acute phase serum samples could be obtained. The hemagglutination-inhibition test failed to reveal the presence of significant amounts of strain-specific antibodies against several known influenza A virus strains.