PROCESS FOR PRODUCING VIRUS AND VACCINE THEREFROM AGAINST INFECTIONS IN POULTRY CAUSED BY TURKEY RHINOTRACHEITIS

摘要

An attenuated strain of the virus of contagious turkey rhinotracheitis is obtained by alternate embryonic egg and tracheal organ culture passaging of the virus of contagious turkey rhinotracheitis. Turkeys may be vaccinated to prevent them getting turkey rhinotracheitis, and chickens may be vaccinated to prevent them getting swollen head syndrome.