Data obtained on losses occurring among various species of waterfowl due to avian cholera were analyzed statistically. Coots, gulls, rodents and rabbits were inoculated with suspensions of Pasteurella multocida.

The relation between population size of the individual waterfowl species and the respective mortality rates was not statistically sigificant. No correlation could be found for the average weights and the death rates occurring in each species. The widgeon duck, white-fronted goose and coot had higher losses from avian cholera than other waterfowl. Gulls were more resistant to P. multicoda than the coot, and the laboratory rat was completely resistant whereas the Norway rat was susceptible.