The Virulence and Viability of Mycoplasma mycoides Strains 111 Chicken Embryos from Normal and Immunized Hens

Abstract

The Gladysdale strain was inoculated into immune and normal chicken embryos and there was a decrease in the number of organisms in the immune embryos, from the 4th day after inoculation, when compared with the normal embryos. Sera from immune hens possessed agglutinating and growth inhibiting antibodies, but yolk extracts from these hens rarely contained agglutinating antibodies. The immunity possessed by embryos persisted at least 17 weeks after immunization of the hens.