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Antigenic Characterization of Infectious Bronchitis Virus¹

From the Department of Microbiology and Public Health, Michigan State University, East Lansing, Michigan

Abstract

Three antigenically distinct soluble antigens (1–3) are associated with infectious bronchitis virus. The antigens are smaller than the virion. Antigens 1 and 3 are destroyed at 100°C, whereas antigen 2 is not. Antigen 2 is a ribonucleoprotein. The virus is sensitive to ether and sodium deoxycholate. Antigens released by treatment of purified virus with ether are identical to antigens in viral allantoic fluid and in virus-infected CAM. The virus has a buoyant density of 1.2289 g/ml in cesium chloride, whereas antigens 1 and 2 have buoyant densities of 1.14 and 1.18 g/ml, respectively.

Footnotes

¹ Journal article no. 4208 of the Michigan Agricultural Experiment Station.

² Present address: Department of Virology and Epidemiology, Baylor University College of Medicine, Houston, Texas 77025.