Biting Indices, Host-seeking Activity and Natural Infection Rates of Anopheline Species in Boa Vista, Roraima, Brazil from 1996 to 1998

Memórias do Instituto Oswaldo Cruz

Adenildo Da Silva-vasconcelos²  Márcio Yukió Neves Kató²  Eliana Neves Mourão²  Raimundo Tadeu Lessa De Souza¹  Raimundo Nonato Da Luz Lacerda¹  Alexander Sibajev²  Pantelis Tsouris²  Marinete Marins Póvoa¹  Hooman Momen¹  Maria Goreti Rosa-freitas¹ 

[1] ,Universidade Federal de Roraima Dentro de Ciências Biológicas e da Saúde Núcleo Avançado de VetoresBoa Vista RR ,Brasil

关键词: Anopheles;    biting index;    infection rates;    malaria;    Roraima;    Brazil;   

DOI  :  10.1590/S0074-02762002000200002

来源: SciELO

【 摘 要 】

The epidemiology of the transmission of malaria parasites varies ecologically. To observe some entomological aspects of the malaria transmission in an urban environment, a longitudinal survey of anopheline fauna was performed in Boa Vista, Roraima, Brazil. A total of 7,263 anophelines was collected in human bait at 13 de Setembro and Caranã districts: Anopheles albitarsis sensu lato (82.8%), An. darlingi (10.3%), An. braziliensis (5.5%), An. peryassui (0.9%) and An. nuneztovari (0.5%). Nightly 12 h collections showed that An. albitarsis was actively biting throughout the night with peak activities at sunset and at midnight. An. darlingi bit during all night and did not demonstrate a defined biting peak. Highest biting indices, entomological inoculation rates and malaria cases were observed seasonally during the rainy season (April-November). Hourly collections showed host seek activity for all mosquitoes peaked during the first hour after sunset. An. darlingi showed the highest plasmodial malaria infection rate followed by An. albitarsis, An. braziliensis and An. nuneztovari (8.5%, 4.6%, 3% and 2.6%, respectively). An. albitarsis was the most frequently collected anopheline, presented the highest biting index and it was the second most frequently collected infected species infected with malaria parasites. An. albitarsis and An. darlingi respectively, are the primary vectors of malaria throughout Boa Vista.

【 授权许可】

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