Both D. immitis and D. repens are transmitted via the common mosquito vectors, Anopheles, Culex, and Aedes.  However, more than 60 species of mosquitoes from six different genera are capable of acting as the vector-intermediate host.  Also, it is believed that some species of fleas, lice, and ticks also act as vectors of D. immitis (Shah).  D. ursi is transmitted by blackflies, and D. tenuis is transmitted by the black salt marsh mosquitoes, Aedes taeniorhynchus and Anopheles quadrimaculatus (Gutierrez).

Photo of Culex pipiens female.  Image from Iowa State University
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