Aspectos epidemiológicos da malária no Amazonas

Ferraroni, José João; Hayes, Jack

doi:10.1590/1809-43921979093471

Cited by 9 publications

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“…The results indicate that, in agreement with malaria incidence studies (Ferraroni & Hayes, 1979) but in contrast to previous studies on mosquito seasonal incidence (Davis, 1931;Giglioli, 1951;Bruyning, 1952), peak populations of A. darlingi females in the central Amazon basin are present during the transitions between the wet and dry seasons. It is possible that the heavy rainstorms in the rainy season cause a high larval mortality, either by ' flushing out' the breeding sites or by drowning the larvae.…”

Section: Discussionsupporting

confidence: 90%

“…In many species, the greatest numbers and the highest incidence of disease transmission occur in the rainy season. The highest incidence of malaria in the recently colonised areas of the Amazon basin in Brazil occurs during the transition between the wet and dry seasons (Ferraroni & Hayes, 1979), even though the reported peak in numbers of Anopheles darlingi Root, the vector in this area, is at the height of the rains (Davis, 1931;Gilioli, 1951, Bruyning, 1952. Accordingly, an investigation was undertaken to determine what effects changes in rainfall had on the man-biting fraction of two populations of this species in the Amazon basin of Brazil.…”

Section: Introductionmentioning

confidence: 99%

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Observations on The bionomics ofAnopheles darlingiRoot (Diptera: Culicidae) from Brazil

Charlwood

1980

Bull. Entomol. Res.

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The physiological age-structure of populations of the malaria vectorAnopheles darlingiRoot, collected biting man, was determined from collections made from March to June 1979 at the end of the rainy season in the village of Aripuanã, Mato Grosso, Brazil. The number of mosquitoes biting increased during the transition between the wet and dry seasons, but adult survival remained low at all times. Only seven of 1596 females dissected had laid eggs four or more times, and thus the proportion of females that could be potentially infective with malaria sporozoites was 0.4%. The mosquitoes rested in the vicinity of the host for periods of up to 10 min before biting. The results are compared to those obtained during a study onA. darlingion the Manaus-Boa Vista Highway, 1000 km to the north. In this area, peak numbers were collected at the beginning of the rainy season and adult survival was longer than at Aripuanã.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Observations on The bionomics ofAnopheles darlingiRoot (Diptera: Culicidae) from Brazil

Charlwood

1980

Bull. Entomol. Res.

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“…Thus, the end of the rainy season is usually the period of high malaria transmission in riverine areas (Figure 2), but this may vary a little from year to year at each place, depending on microenvironmental peculiarities and pluvial and fluvial regimens. 10 The main malaria vector is Anopheles darlingi, which accounts for > 90% of the anopheline fauna of Rondônia. 4,[11][12][13][14] The Portuchuelo community (63°49Ј28ЉW, 8°37Ј44ЉS) is located on the right bank of the Madeira River, 34 km downstream from the capital, Porto Velho, and has been described in detail before.…”

Section: Methodsmentioning

confidence: 99%

High prevalence of asymptomatic Plasmodium vivax and Plasmodium falciparum infections in native Amazonian populations.

Alves¹,

Durlacher²,

Menezes³

et al. 2002

The American Journal of Tropical Medicine and Hygiene

264

215

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Abstract. The epidemiology of malaria in 2 riverine localities in Rondônia, Brazilian western Amazônia, was assessed by a 1-year study at Portuchuelo, and a cross-sectional survey at riverine communities at Rio Machado ‫ס(‬ Ji-Paraná). Plasmodium spp. infections were diagnosed by light microscopy and by polymerase chain reaction (PCR) amplification of ribosomal DNA. PCR was 6-7 times more efficient than microscopy for detecting plasmodial infections. Both Plasmodium vivax and Plasmodium falciparum infections occurred as asymptomatic and symptomatic forms of the disease. The relation between symptomatic and asymptomatic clinical forms was roughly similar for both species of Plasmodium. Symptomless patients were monitored for 2 months. The prevalence of symptomless infections was 4-5 times higher than the symptomatic ones-respectively, 20% and 4.6% for Portuchuelo and 49.5% and 10% for JiParaná. Symptomatic malaria occurred mostly in patients in younger age groups. In contrast, there was a significant association of symptomless malaria with older age groups (medians of 26.5 and 21 years, respectively, for Portuchuelo and Ji-Paraná), whereas the age medians for symptomatic malaria were 14 and 8 years, respectively, in the 2 regions. Symptomatic malaria also was more prevalent in groups living for shorter times in Amazônia (13 and 4 years, respectively, for Portuchuelo and Ji-Paraná) as compared with symptomless malaria, which was more prevalent in groups living for longer periods in the region (medians of 25.5 and 18 years, respectively, for Portuchuelo and Ji-Paraná). The high prevalence of symptomless malaria may pose new problems for the currently adopted strategy for the control of malaria in the Amazonian region, which is essentially based on the treatment of symptomatic patients.

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“…Diferentes autores têm enfatizado que em regiões endêmicas da malária modificações ambientais podem alterar o grau de incidência dessa doença (Boyd, 1949;Ferraroni & Hayes, 1979;Ferraroni & Speer, 1981;Meira et al, 1980;Moran, 1981 Anopheles nuñez-tovari Gabaldón, 1940. triannulatus (Neiva & Pinto, 1922.…”

Section: Introductionunclassified

BIOLOGIA DE ANOFELINOS AMAZÔNICOS. VIII. Conhecimentos sobre a distribuição de espécies de Anopheles na região de Tucuruí-Marabá (Pará)

Tadei¹,

Mascarenhas²,

Podestá³

1983

Acta Amaz.

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Resumo Foram obtidos dados sobre grau de incidência e distribuição de espécies de Anopheles, de interesse epidemiológico, da área de influência do reservatório da Hidrelétrica de Tucuruí (Pará). As coletas foram desenvolvidas no período de julho a setembro de 1980 e em dois períodos de 1981 fevereiro/março e outubro/novembro. Os pontos de coleta localizaram-se ao longo das rodovias Transamazônica (BR-230) trecho Marabá-Vila Repartimento, BR-422, PA-263, rio Tocantins, Vale do Caraipé, cidade de Tucuruí, área do Canteiro de Obras e núcleos residenciais Permanente e Temporário. Foi analisado um total de 9.918 anofelinos e constatada a ocorrência de doze espécies, distribuídas nos subgêneros Nyssorhynchus, Arribalzagia e Anopheles, predominando as espécies do primeiro. Anopheles darlingi, principal vector da malária humana, foi detectado em diferentes pontos da área, tanto na forma alada como na forma larvária. Foi questionada a possibilidade de que A. nuñez-tovari, A. triannulatus e A. oswaldoi sejam vectores secundários da malária na região, pois A. darlingi foi registrada nos pontos em que ocorreram casos autóctones de malária. Contudo, como as três espécies foram registradas em altas densidades populacionais e também como A. noroestensis e A. albitarsis apresentaram distribuição ampla, sugere-se que essas espécies sejam controladas na área. É discutida a hipótese de que focos de A. darlingi, provavelmente, venham a se instalar em diferentes pontos do reservatório, assim como focos de A. nuñez-tovari, A. triannulatus, A. oswaldoi e A. albitarsis. Considerando-se que foram constatados focos de A. darlingi nas proximidades dos núcleos residenciais Permanente e Temporário, sugere-se a transformação gradativa da mata circundante em um cinturão de vegetação não densa, objetivando-se a formação de uma área de dimensão suficientemente grande para isolar os núcleos residenciais e as populações de A. darlingi localizadas nas imediações.

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Aspectos epidemiológicos da malária no Amazonas

Cited by 9 publications

References 0 publications

Observations on The bionomics ofAnopheles darlingiRoot (Diptera: Culicidae) from Brazil

Observations on The bionomics ofAnopheles darlingiRoot (Diptera: Culicidae) from Brazil

High prevalence of asymptomatic Plasmodium vivax and Plasmodium falciparum infections in native Amazonian populations.

BIOLOGIA DE ANOFELINOS AMAZÔNICOS. VIII. Conhecimentos sobre a distribuição de espécies de Anopheles na região de Tucuruí-Marabá (Pará)

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