One strain of Chl. psittaci was isolated from two aborted foetuses of two cows coming from the same locality. Tissue from the lungs of the aborted foetuses was used for the isolation tests; after sample preparation this tissue was inoculated into the yolk sacs of chick embryos. It was found on the basis of serological examination (RVK) that both aborting cows had positive levels of antibodies against the Chl. psittaci antigen at a serum dilution ratio of 1 : 64. The serological examination for brucellosis (BAB) and coxiellosis was negative. The bacteriological examination (aerobic and anaerobic cultivation, salmonellae, mycoplasms and moulds) also gave negative results.
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