Efficacy of rifampicin in the treatment of experimental acute canine monocytic ehrlichiosis

Konstantina Theodorou, Mathios E. Mylonakis*, Victoria I. Siarkou, Leonidas Leontides, Alexander F. Koutinas, Christos K. Koutinas, Maria Kritsepi-Konstantinou, George Batzias, Eugenia Flouraki, Osnat Eyal, Vassilios Kontos, Shimon Harrus

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Objectives: To assess the efficacy of rifampicin in achieving clinical and haematological recovery and clearing infection in dogs with experimentally induced acute monocytic ehrlichiosis. Methods: Five Ehrlichia canis-infected Beagle dogs were treated with rifampicin (10 mg/kg/24 h orally for 3 weeks), nine E. canis-infected dogs received no treatment (infected untreated dogs) and two dogs served as uninfected controls. Clinical score, platelet counts, immunofluorescent antibody titres and PCR detection of E. canis-specific DNA in blood, bone marrow and spleen aspirates were evaluated on post-inoculation days 21 (start of rifampicin), 42 (end of rifampicin) and 98 (end of the study). Results: By day 21 post-inoculation, all infected dogs became clinically ill and thrombocytopenic, seroconverted and were PCR positive in at least one tissue. Clinical scores and antibody titres did not differ between the treated and infected untreated dogs throughout the study. The rifampicin-treated dogs experienced an earlier resolution of their thrombocytopenia (Kaplan-Meier survival plot, P=0.048), and the median platelet counts were significantly higher in the treated compared with the infected untreated dogs on post-inoculation days 42 (P=0.0233) and 98 (P=0.0195). At the end of the study, three treated and six untreated infected dogs remained PCR positive in one tissue each. Conclusions: The rifampicin treatment regimen applied in this study hastened haematological recovery, but was inconsistent in eliminating the acute E. canis infection.

Original languageAmerican English
Pages (from-to)1619-1626
Number of pages8
JournalJournal of Antimicrobial Chemotherapy
Issue number7
StatePublished - 1 Jul 2013

Bibliographical note

Funding Information:
This work was supported by the Companion Animal Clinic, School of Veterinary Medicine, Aristotle University of Thessaloniki, Greece, and the Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Israel.


  • Dogs
  • Ehrlichia canis
  • Therapy


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