| tyzzer's disease in free-living cottontail rabbits (sylvilagus floridanus) in maryland. | complement-fixing (cf) antibody to bacillus piliformis antigen was found in 9 of 14 (64%) serum samples obtained from cottontail rabbits (sylvilagus floridanus) killed in the wild. cf antibody was not present in the serum of 8 cottontail rabbits trapped as juveniles in the same geographic areas and held in captivity for 4 years. sero-negative cottontail rabbits died acutely with lesions typical of tyzzer's disease following the intragastric administration of 10(3.8) eld50 of b. piliformis spores ... | 1976 | 16502694 |