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Antimicrobial Agents and Chemotherapy, February 1998, p. 362-368, Vol. 42, No. 2
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Doxycycline Hyclate Treatment of Experimental Canine Ehrlichiosis Followed by Challenge Inoculation with Two Ehrlichia canis Strains

Edward B. Breitschwerdt,* Barbara C. Hegarty, and Susan I. Hancock

Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27606

Received 5 June 1997/Returned for modification 25 September 1997/Accepted 10 November 1997

Dogs were experimentally inoculated with Ehrlichia canis Florida to assess the efficacy of doxycycline hyclate for the treatment of acute ehrlichiosis. Treatment with doxycycline eliminated infection in eight of eight dogs. Untreated infected control dogs appeared to eliminate the infection or, alternatively, suppress the degree of ehrlichiemia to a level not detectable by tissue culture isolation or PCR or by transfusion of blood into recipient dogs. Prior infection did not infer protection against homologous (strain Florida) or heterologous (strain NCSU Jake) strains of E. canis. We conclude that doxycycline hyclate is an effective treatment for acute E. canis infection; however, these results may not be applicable to chronic infections in nature. Spontaneous resolution of infection, induced by the dog's innate immune response, provides evidence that an E. canis vaccine, once developed, might potentially confer protective immunity against the organism.

* Corresponding author. Mailing address: College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough St., Raleigh, NC 27606. Phone: (919) 829-4234. Fax: (919) 829-4336. E-mail: Ed_Breitschwerdt{at}ncsu.edu.

Antimicrobial Agents and Chemotherapy, February 1998, p. 362-368, Vol. 42, No. 2
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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Copyright © 1998 by the American Society for Microbiology. All rights reserved.