Q fever (Coxiella burnetii) investigations in dairy cattle: challenge of immunity after vaccination
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Q fever (Coxiella burnetii) investigations in dairy cattle: challenge of immunity after vaccination
Am J Vet Res.
1976 Jun.
Free article
Abstract
The immunity of Holstein-Friesian dairy cows vaccinated against Coxiella burnetii was challenged with 4 X 10(8) infective guinea pig doses of viable rickettsiae. Cows that were vaccinated had normal full-term calves, whereas 2 nonvaccinated cows aborted late in pregnancy. Intrauterine infection of the fetus was indicated by recovery of the organism from tissues of the fetus. Coxiella burnetii was recovered from milk, colostrum, and placenta of vaccinated and nonvaccinated cows after challenge inoculation, but the rickettsiae recovered were as many as 1,000 times more numerous in nonvacinated cows.
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