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This study was attempted to survey on the prevalence of canine heartworm infection (Dirofilaria immitis) in the Incheon area in 2006. This study showed comparison of canine heartworm infection rates by geographic distribution and whether they were indoor, outdoor dogs or free roaming dogs. Total 24 dogs (6.0%) were D. immitis positive from 400 tested dogs in geographic distribution of detective rate. Geographic distribution of detective rate were Nam-gu (2 dogs, 6.7%), Yeonsu-gu (1 dog, 3.0%), Namdong-gu (5 dogs, 8.0%), Pupyoung-gu (4 dogs, 6.7%), Kanghwa-gun (8 dogs, 13.0%), and Onjin-gun (4 dogs, 11.1%). And total 4 dogs (2.0%) were D. immitis positive from 202 indoor dogs and 20 dogs (10.0%) were D. immitis positive from 198 outdoor dogs including free roaming dogs, while 13 dogs (11.7%) were D. immitis positive from 111 outdoor dogs excluding free roaming dogs. 7 of 87 dogs (8.1%) were positive in case of free roaming dogs.