Subclinical Infection of Babesia gibsoni in Dogs in an Endemic Area in Japan

Abstract

The subclinical infection of Babesia gibsoni in 500 clinically healthy dogs was examined in an endemic area for canine babesiosis in Japan. A total of 38 dogs (7.6%) was defined as having a subclinical infection based on positive results of B. gibsoni-specific PCR. The mean age of dogs with a subclinical infection was 9.2 years, which was significantly higher than that of dogs with negative PCR and no histor y of B. gibsoni infection (7.4 years). Almost all dogs in the subclinical population (97.4%) go outside regularly. Analysis of 275 dogs with a habit of going outside and no histor y of B. gibsoni infection revealed significantly lower complete prevention rate for tick infestation in the subclinical population (6.3%) than the PCR-negative population (44.8%). Outdoor activity and incomplete tick-prevention were thought to be risk factors for B. gibsoni infection. Red blood cell counts, packed cell volume, hemoglobin concentration and platelet counts for dogs with a subclinical infection were all significantly lower than those of dogs without an infection and history of B. gibsoni infection. It is obvious that subclinical infection of B. gibsoni affects blood test findings of dogs. PU - Japan Veterinary Medical Association PA - Tokyo