The chorioallantoic membrane (CAM) inoculated chick embryo model was used to study the effect of host lineage on the virulence of Campylobacter jejuni and Campylobacter coli. LD50 values were used to compare the susceptibilities of chick embryos from eight inbred chicken lines to infection by four strains of C. jejuni and one strain of C. coli. Differences in susceptibility were found between i...

The titration curve for the virus of Eastern equine encephalomyelitis inoculated into the 10 day old chick embryo shows that the maximum increase in virus content continues until shortly before the generalized destruction of the embryo is apparent. This is followed by a stationary phase. Histological studies of infected embryos fail to demonstrate selective tissue destruction, and titrations sh...

The pathogenic strain Italien and the apathogenic strain Ulster of Newcastle disease virus have been compared with respect to organ tropism and spread of infection in 11-day-old chick embryos. After infection of the endodermal layer of the chorioallantoic membrane by intra-allantoic inoculation with strain Italien, high virus titres are found in all extra-embryonic membranes and fluids and in t...