Abstract
The prevalence of canine heartworm (Dirofilaria immitis) was examined in the domestic dog, coyote (Canis latrans), and red fox (Vulpes fulva) populations of southeastern Nebraska. Microfilariae were detected in 21.4% (22 of 103) of the domestic dogs. The average age of infection for dogs was 5.8 yr. Nine of the 22 infected dogs also were positive for Dipetalonema reconditum. Thirty-nine of 443 (8.9%) coyotes were found to have adult heartworms. The average number of male and female worms per heart was 3.7 and 3.9, respectively. The mean age of infected coyotes was 3.6 yr. Red foxes had an infection rate of 4.8% (1 of 21). This fox heart had only 1 immature female worm. A mail survey of 6 veterinary clinics was also conducted. Veterinarians reported infection rates of 0% to 18.8% in domestic dogs for their localities.
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