RESUMO
Mosquitoes of the Anopheles gambiae complex (N = 1,336) were sampled (2001-2005) across Angola to identify taxa, study inversion polymorphisms, and detect the circumsporozoite protein of Plasmodium falciparum. Anopheles gambiae s.s. was found in all sites; it was characterized as M-form in localities of the tropical dry and semi-desertic belts, whereas the S-form was predominant in comparatively more humid and less anthropized sites. Both forms were characterized by low degrees of chromosomal polymorphism based solely on the 2La inversion, a pattern usually associated with An. gambiae populations from forested, humid, and derived savanna areas. Unexpectedly, this pattern was also observed in M-form populations collected in dry/pre-desertic areas, where this form largely predominates over An. arabiensis, which was also detected in central/inland sites. Anopheles melas was found in northern coastal sites. Three of 534 An. gambiae s.s. were positive for P. falciparum CS-protein, whereas none of the 105 An. melas were positive.
Assuntos
Anopheles/genética , Cromossomos/química , Insetos Vetores/genética , Malária Falciparum/epidemiologia , Malária Falciparum/transmissão , Angola/epidemiologia , Animais , Anopheles/parasitologia , Anopheles/fisiologia , Clima , Habitação , Humanos , Insetos Vetores/parasitologia , Insetos Vetores/fisiologia , Malária Falciparum/etiologia , Malária Falciparum/prevenção & controle , Plasmodium falciparum/patogenicidade , Densidade DemográficaRESUMO
The chromosomal polymorphism of Anopheles funestus sensu stricto from Angola was analyzed from indoor-resting samples collected in 11 peri-urban and rural sites of the Luanda and Huambo Provinces, which are > 450 km apart and have distinct eco-climatic conditions. Five polymorphic paracentric inversions were observed (scored chromatids range = 202 to 248): 2Ra, 2Rh, 3Ra, 3Rb, and 3La. Inversions 3Rb and 3La were highly polymorphic; the 2Ra and 3Ra arrangements were absent in Luanda. No significant departures from Hardy-Weinberg and linkage equilibria were found at the locality, commune, or province level (sites Assuntos
Anopheles/classificação
, Cromossomos/genética
, Insetos Vetores/classificação
, Malária/transmissão
, Angola/epidemiologia
, Animais
, Anopheles/genética
, Anopheles/parasitologia
, Clima
, Feminino
, Habitação
, Humanos
, Insetos Vetores/genética
, Insetos Vetores/parasitologia
, Polimorfismo Genético
, Saúde da População Rural
, Estações do Ano
, Saúde da População Urbana