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Ultraviolet irradiation as a protective measure for chickens exposed to Newcastle disease virus.

Abstract Spread of Newcastle disease virus (NDV) to susceptible chicken flocks occurs mainly by air-borne particles (Kohn, 1955). Young chickens are considered refractory to early vaccination due to incomplete ability to produce antibodies. Congenital passive immunity seems to interfere with the development of active immunity in response to ND vaccine when administered intermuscularly (Bankovsky et al. 1958; Keeble and Wade, 1963) or intranasally (Rickey and Schmittle, 1962). Early vaccinations of chicks with a lentogenic live NDV strain or with a BPL inactivated vaccine failed to protect young chicken flocks in Israel during an epidemic in 1967–69 (authors observations). The failure of biological measures to control the disease prompted the authors to search for a possible physical route of protection. Since ultraviolet (UV) irradiation at wavelength of 2537 A. is amazingly effective in killing various kinds of microorganisms when suspended in the air as droplets nuclei (Wells, 1955), the authors found…