Dry aerosol vaccination against Newcastle disease. I. Safety and activity controls on chickens.

A new technic or immunization against Newcastle disease in chicken was developed: this method consists of dispersing lyophilized products by aerosols. One to fourteen day old chickens, with and without parental antibodies, were vaccinated with increasing amounts (10(-1) to 10(5)EID50) of HB1 and LaSota attenuated viruses. 10(4)EID50, inhaled theoretical… (More)