A STUDY IN ACTIVE IMMUNIZATION AGAINST FOWL CHOLERA

Fowl cholera immunization in turkeys. 3. Significance of market quality in the evaluation of fowl cholera vaccines.

Turkeys vaccinated with various experimental vaccines and a commerical bacterin for fowl cholera and surviving an artificially induced epornitic were killed, and their carcasses were examined for wholesomeness. It was evident that, if the "fitness for human consumption" judgement was considered in addition to mortality, efficacy ratings of the various vaccines changed. This suggests that the "f...

Fowl cholera.

Pasteurella multocida subspecies multocida is the most common cause of fowl cholera, although P. multocida subspecies septica and gallicida may also cause fowl cholera-like disease to some extent. However, the virulence properties of the different subspecies for various hosts have not been elucidated. The severity and incidence of P. multocida infections may vary considerably depending on sever...

Active Immunization against Poliomyelitis

1. A single intracutaneous inoculation with a subinfective dose of the virus of poliomyelitis produces considerable immunity. 2. Virus-serum combinations produce an appreciable immunity, providing just sufficient serum is used to protect the animal from paralysis. If there is an excess of serum, the degree of immunity is considerably reduced.

The Epidemiology of Fowl Cholera

The Epidemiology of Fowl Cholera

Field studies of fowl cholera on two commercial poultry farms are described. One farm, previously free of cholera, was studied during an active epidemic, which occurred during the winter months. The strains of P. avicida recovered, both from "autopsy" and from "healthy carriers" proved generally similar, and to be of the "fluorescent" or "intermediate" colony type, which is of relatively high v...