Comparative Susceptibility of Four Strains of Aedes Aegypti (Diptera: Culicidae) to Infection with Dirofilaria Immitis

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Abstract
Susceptibility to infection with Dirofilaria immitis was studied in 4 strains of Aedes aegypti (Rock, Vero Beach, BLACK-EYE and Liverpool). Arrested development was the most important manifestation of resistance in the Rock and Vero Beach strains, whereas the trapping of parasites in the midgut and arrested development of microfilariae were equally important in the BLACK-EYE strain. Midgut resistance was the most important factor limiting the establishment of D. immitis in the Liverpool strain. Melanization played only a minor role in the strains examined. Virtually all mosquitoes examined could be placed in 1 of 2 groups: mosquitoes in which most parasites underwent larval development, and those in which most parasites were arrested in the microfilarial stage. The percentages of mosquitoes harboring 80♂100% developing larvae throughout the infection period, reflecting their relative susceptibilities to D. immitis, were: Rock, 1%; Vero Beach, 21%; BLACK-EYE, 37%; and Liverpool, 56%.

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