A Survey of Avian Sera for Avian Nephritis Virus, Strain AAF7, in Japan

Abstract

A total of 1085 sera collected or submitted from 217 chicken flocks during 1988-89 were examined for antibody to avian nephritis virus, strain AAF7, by the indirect immunofluorescence test. Antibody was positive in 565 (52.1%) sera from 185 (85.3%) flocks tested. There was no difference in positive rates between broiler and layer chickens, nor among districts. It was shown that 28 (77.8%) of 36 breeding flocks had antibody to the strain AAF7.