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Screening of 25,822 dog blood samples indicated approximately a 1% infection rate with Dirofilaria immitis. Dipetalonema reconditum microfilariae were found in approximately 2% of 1,876 feral dogs examined. Laboratory experimentation indicated that 6 of 10 local mosquito species examined allowed successful extrinsic incubation of D immitis. Indices of experimental infection indicated Aedes triseriatus and Anopheles quadrimaculatus were excellent hosts for D immitis, but other factors considered, Aedes vexans probably served as the primary vector of D immitis. Coquillettidia perturbans and Culex pipiens-restuans group were considered unsuitable hosts and thus unlikely vectors of canine heartworm. Natural filarial infections were found in An quadrimaculatus and Ae vexans.
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