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  • Title: Preliminary studies on transmission of Chlamydia to cattle by ticks (Ornithodoros coriaceus).
    Author: McKercher DG, Wada EM, Ault SK, Theis JH.
    Journal: Am J Vet Res; 1980 Jun; 41(6):922-4. PubMed ID: 7436080.
    Abstract:
    Preliminary findings indicate that Ornithodoros coriaceus ticks can harbor Chlamydia for long periods and are able to transmit the agent to cattle. Field-collected O coriaceus ticks, which were infected experimentally with a bovine chlamydial agent from an aborted fetus, transmitted the agent 25 and 48 days later to three pregnant heifers. Two of these heifers aborted and the third delivered a term calf. The control heifer also aborted after intradermal (simulated tick) exposure. Also, a chlamydial agent was isolated from field-collected O coriaceus ticks in an epizootic bovine abortion (EBA)-enzootic area that were held for at least 6 months. In the same enzootic area, a chlamydial agent was isolated from a prematurely delivered calf during a severe EBA outbreak. Seemingly, this species is a cause, if not the cause, of EBA.
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