An enzyme-linked immunosorbent assay was used to detect Cowdria ruminantium antibodies during the course of heartwater disease. IgM antibodies reached a maximum on the 4th day after infection and disappeared on the 7th day. IgG antibodies first appeared on the 8th day and continued to increase during the remainder of the
observation period of 28 days. The presence of C. ruminantium in the blood fractions of diseased animals was demonstrated by an enzyme-linked immunosorbent assay. The earliest day of C. ruminantium antigen detection was in plasma and serum on the 4th day after inoculatton. Of all the blood fractions investigated, the red blood cells showed the highest concentration, and this reached a maximum on the 12th day after infection.
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