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Background  While Koch’s postulates have been fulfilled for Lyme disease; causing transient fever, anorexia and arthritis in young dogs; treatment of sero-positive dogs, especially asymptomatic animals, remains a topic of debate. To complicate this matter the currently recommended antibiotic treatments of Lyme Disease in dogs caused by  Borrelia burgdorferi  require daily oral administrations for 31 days or longer, which makes non-compliance a concern. Additionally, there is no approved veterinary antimicrobial for the treatment of Lyme Disease in dogs in the USA and few recommended treatments have been robustly tested.   In vitro  testing of cefovecin, a novel extended-spectrum cephalosporin, demonstrated inhibition of spirochete growth. A small pilot study in dogs indicated that two cefovecin injections two weeks apart would be as efficacious against  B. burgdorferi  sensu stricto as the recommended treatments using doxycycline or amoxicillin daily for 31 days.  This hypothesis was tested in 17–18 week old Beagle dogs, experimentally infected with  B. burgdorferi  sensu stricto, using wild caught ticks, 75 days prior to antimicrobial administration.    Results  Clinical observations for lameness were performed daily but were inconclusive as this characteristic sign of Lyme Disease rarely develops in the standard laboratory models of experimentally induced infection. However, each antibiotic tested was efficacious against  B. burgdorferi  as measured by a rapid elimination of spirochetes from the skin and reduced levels of circulating antibodies to  B. burgdorferi . In addition, significantly less cefovecin treated animals had Lyme Disease associated histopathological changes compared to untreated dogs.    Conclusions  Convenia was efficacious against  B. burgdorferi  sensu stricto infection in dogs as determined by serological testing, PCR and histopathology results. Convenia provides an additional and effective treatment option for Lyme Disease in dogs.

Comparison of effectiveness of cefovecin, doxycycline, and amoxicillin for the treatment of experimentally induced early Lyme borreliosis in dogs