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VECTORIAL COMPETENCE OF AEDES AEGYPTI (LINNAEUS 1762) RIO DE JANEIRO STRAIN, TO DIROFILARIA IMMITIS (LEIDY 1856)
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Entomologia. Laboratório de Transmissores de Hematozoários. Rio de Janeiro, RJ, Brasil.
Universidade Federal Fluminense. Centro de Ciências Médicas. Faculdade de Veterinária. Niterói, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Entomologia. Laboratório de Transmissores de Hematozoários. Rio de Janeiro, RJ, Brasil.
Universidade Federal Fluminense. Centro de Ciências Médicas. Faculdade de Veterinária. Niterói, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Entomologia. Laboratório de Transmissores de Hematozoários. Rio de Janeiro, RJ, Brasil.
Abstract
Dirofilaria immitis (Leidy 1856), a nematode parasite, is the etiologic agent of canine heartworm
disease and mosquitoes are essential intermediate hosts. Mosquito susceptibility to the worms differ
with species, strains and also among individuals of the same strain. To evaluate the degree of susceptibility of Rio de Janeiro laboratory raised strain of Aedes aegypti, we fed mosquitoes on canine blood
with different densities of microfilariae (mf). There was no significant difference in the rate of development among the three different densities of mf. Infective larvae were found in the head and proboscis of
all mosquitoes provided bloodmeals with different densities of mf after the 11th day post-infection. The
infection rate of mosquitoes after ingestion of blood containing 3,000 mf/ml, 5,000 mf/ml and 7,000 mf/
ml were 55.3%, 66.7% and 100%, respectively. The vector efficiency indices ranged from 1.6 to 9.3. The
finding of L3 stage larvae, high infection rates and vector efficiency indices suggest that Ae. aegypti,
Rio de Janeiro laboratory strain, is a potential vector of D. immitis, although of low efficiency.
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