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The prevalence of IgG-antibodies reactive with an Israeli strain of Rickettsia conorii (Israeli strain 487), the agent of Israeli spotted fever, was examined in humans and dogs from two rural villages in Israel where the disease has been reported in humans. Sixty-nine of 85 (81%) canine sera and 14 of 136 (10%) of human sera had anti-R. conorii antibodies. No direct association could be made between seropositivity of people and ownership of a seropositive dog. This study indicates that exposure to spotted fever group rickettsiae was highly prevalent among dogs compared with humans in the two villages examined, probably reflecting a greater exposure rate of canines to the tick vector. These results support a previous suggestion that canine serology could be a sensitive indicator for the presence and magnitude of human exposure to R. conorii.
Received January 1, 2007. Accepted for publication March 19, 2007.
* Address correspondence to Shimon Harrus, School of Veterinary Medicine, The Hebrew University of Jerusalem, PO Box 12, Rehovot, Israel. E-mail: harrus{at}agri.huji.ac.il
Authors addresses: Shimon Harrus and Gad Baneth, School of Veterinary Medicine, The Hebrew University of Jerusalem, PO Box 12, Rehovot, Israel, E-mail: harrus{at}agri.huji.ac.il. Yael Lior and Frans Jongejan, University of Utrecht, Utrecht, The Netherlands. Moshe Ephros, Carmel Medical Center and Faculty of Medicine, Technion, Haifa, Israel. Galia Grisaru-Soen, Dana Childrens Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel. Avi Keysary, Carmella Strenger, and Trevor Waner, Israel Institute for Biological Research, Ness Ziona, Israel.
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