En right, J. B. (Dept. of Epidemiology and Preventive Medicine, Univ. of California, Davis, Calif. 95616) W. M. Longhurst, C. E. Franti, D. E. Behymer, V. J. Dutson and M. E. Wright. Coxiella burneti in a wildlife-livestock environment; isolations of rickettsiae from sheep and cattle. Amer J Epidem 94: 72–78, 1971.— Coxiella burneti was studied in sheep and cattle during parturition as part of an ecological investigation of Q fever in an area shared by livestock and wildlife. The rickettsiae were isolated from 13 of 52 (25%) placentas from resident ewes and the milk of 2 postpartum cows. A herd of nonresident cattle was pastured on the sheep range for 6 months, during which time the proportion of the herd with specific antibodies increased from 5 to 71%. The comparatively low antibody titers in sheep and the low virulence of the strains of C. burneti isolated from ewes indicate a possible adjustment in the host-parasite relationship through prolonged sheep-to-sheep transmission.
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