Potential vectors of dog heartworm (Dirofilaria immitis) in northeast Arkansas

Since very little information is known on the potential vectors of dog heartworm, Dirofilaria immitis (Leidy), in northeast Arkansas, a multi-year mosquito survey was conducted to identify which species of mosquitoes carry D. immitis in this area. Mosquitoes were collected from August-October 2008 and April-October 2009 using black light UV traps. Fifteen mosquito species were identified. Anopheles quadrimaculatus and Culex erraticus were the two most commonly collected mosquitoes during the study. All specimens were examined for D. immitis using PCR molecular techniques. Five mosquito species, Aedes vexans, An. quadrimaculatus, Culex pipiens, Cx. erraticus and Psorophora columbiae were positive for D. immitis. This is the first study to provide information on the seasonal distribution of dog heartworm in mosquitoes in northeast Arkansas. This data will provide information to help veterinary practitioners to more accurately determine when mosquitoes are more prone to harbor D. immitis and potentially transmit this nematode.