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A cold complement fixation test (CFT) was used to identify C. abortus infection in ewes and does in northern Jordan. Sera from 36 flocks of sheep and 20 flocks of goats were collected randomly. The results showed that 433 (21.8%) out of 1 984 ovine sera, and 82 (11.4%) out of 721 caprine sera, were seropositive for C. abortus infection, as indicated by a titre &amp;ge; 1:40. However, all the tested sheep flocks and goat flocks (100%) revealed at least one seropositive animal. There was a strong association (P &amp;lt; 0.05) between the rate of C. abortus infection and the size of the sheep flock, when larger flocks had higher infection rates. However, in goats, the flock size had no relationship with seropositivity. Age had no significant (P &amp;gt; 0.05) impact on C. abortus seropositivity. In sheep, there was a significant difference (P &amp;lt; 0.05) between the rates of the chlamydial infection in the four studied areas of northern Jordan. The highest infection rate in sheep (31.2%) was recorded in Mafraq area, while the rates in Irbid, Ajloun and Jerash were 18.5%, 11.2% and 13.9%, respectively. In goats, there was no significant difference between the rates of the chlamydial infection in the two areas studied. The rates of goat infections were 10.8% and 11.8% in Ajloun and Jerash areas, respectively.

Seroprevalence of antibodies to chlamydophila abortus shown in awassi sheep and local goats in jordan