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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 93, No. 2, 1998, pp. 145-154
Bioline Code: oc98027
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 93, No. 2, 1998, pp. 145-154

 en Mosquito frequency and feeding habits in an enzootic canine Dirofilariasis area in Niteroi, State of Rio de Janeiro, Brazil
Norma Labarthe; Maria Lucia Serrao; Yuri Fontenele Melo; Sebastiao Jose de Oliveira & Ricardo Lourenco-de-Oliveira

Abstract

Heartworm, a chronic fatal mosquito-borne canine disease, is frequently
diagnosed in dogs from the State of Rio de Janeiro, where its prevalence is
29.7% in the city of Niteroi. Nevertheless it is rarely detected in cats
(0.8%) from the same state. Dogs are the primary source of infection to
mosquitoes, because cats either do not demonstrate microfilaremia or it is
too low and transient for transmission. A mosquito survey was conducted in
Itacoatiara, Niteroi, from March 1995 to February 1996, using canine,
feline and human baits. A total of 21 mosquito species (3,888 females) was
collected and biting frequency was highest at dusk. The four species
collected most frequently (88.9%) were: Aedes taeniorhynchus (30% of
the total catch; with the peak in May/June); Culex quinquefasciatus
(22.5%; August/October); Aedes scapularis (19.4%; August,
October/November and January) and Culex declarator (17%;
November/January). Human baits were attractive to these species and dogs
were significantly more attractive to them than cats. Ae.
taeniorhynchus, Cx. quinquefasciatus, Ae. scapularis, Cx. declarator and
Cx. nigripalpus are the most likely mosquito species to transmit
Dirofilaria immitis parasites to dogs and may transmit the parasite
to humans. It is also suggested that the vector to cats belongs to the
genus Culex.

Keywords
Dirofilaria immitis - heartworm - mosquito frequency - mosquito feeding habits - canine - feline

 
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