In this experiment, bloods of 12 breeds of animals were tested for their inhibitory action against 12 strains of Past. multocida in order to determine the relationship between inhibitory action and susceptibility of animals to Pasteurella organism. The results are shown as follows. (1) The inhibitory action of bloods of sheep, goat, cattle and horse to Past. multocida was the strongest. (2) The inhibitory action of bloods of swine, water buffalo, chicken and Muscovy duck was little or none. (3) The inhibitory action of bloods of dog, native duck, rabbit and guinea pig was found to be ranked between the above-mentioned two groups of animals. (4) In comparing the inhibitory action of bloods of related animals, that of the native ducks was stronger than that of Muscovy ducks, and that of cattle was stronger than that of buffaloes. (5) The inhibitory action of animal blood to Past. multocida showed some variance in strains but not in sources of the organism. (6) The intermediate inhibitory zone phenomenon was found in the bloods of guinea pig, rabbit, and water buffalo. The rate of occurrence was different in animal breed and individual. (7) From the standpoint of the inhibitory action of blood to Past. multocida, the susceptibility of animals to Past. multocida infection was discussed. Acknowledgement: This study was supported by a grant-in-aid from the National Council on Science Development 1959.
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