Survey of Infectious Bronchitis-Neutralizing Antibody of Chickens in Osaka Prefecture and Its Neighborhood

Abstract

From November, 1963, to January, 1965, serum samples were collected from fowls and young chickens showing respiratory symptoms. They were tested for neutralizing antibody against the Shiga strain of infectious bronchitis virus.
Sixty-eight serum samples out of 119 (57.1 per cent) revealed a neutralization index of more than 2.0, and 89 samples (74.8 per cent) more than 1.0. Neutralizing antibodies of infectious bronchitis virus are widespread among poultry in Osaka, Nara, Kyoto, and Hyogo Prefectures.
In the traditional and intensive poultry farming zones, young chickens have been infected with infectious bronchitis virus.