A longevidade do Aedes aegypti durante a estação chuvosa no município de Fortaleza. / The longevity of Aedes aegypti during the rainy season in Fortaleza.

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

29/03/2010

RESUMO

Dengue fever constitutes a serious world health problem and the state of Ceará has been showing dengue fever since the year of 1986. In Fortaleza city, the capital of the state of Ceará it the was registered a great number of dengue epidemics, highlighting that the incidence of dengue fever is bigger during the rainy season rather than the non-rainy season. McDonald (1952) has defined that for the vector capacity the lifetime of the vector is more important that the vector density in the disease transmission. In that way the present experimental study that took place in Fortaleza City, between the months of April and June, using the aedes aegypti F mosquito generation collected on the ground was effected with the purpose of estimating the middle lifetime of Aedes aegypti in natural environmental conditions with temperature and humidity floating during the rainy season and its relation with the increase of incidence of dengue fever incidence, therefore trying to explain why a great number of dengue fever occurs in Fortaleza and why the incidence of dengue fever is bigger in the rainy season than the non-rainy season. In the three experiments it was used the generation of Aedes aegypti mosquito collected on the ground and maintained in sealed wooden cages under floating temperature and humidity conditions of a residential property. To the adult mosquitoes a sugar solution in 10 per cent was given and a bloody feeding with a tinamou for three hours and dark pots with filter paper glued on the wall for the ovulation. The measures of temperature and humidity were registered every day by a thermo- hydrometer. The dead mosquitoes were monitored daily, differing by gender and registered. Survival tables were elaborated through the life table method, as well as graphics that were elaborated by the Kaplan-Meier method. It was evidenced that in the three experiments, the survival of the females was significantly bigger that the males survival (p<0,001in the three experiments). By gathering the three experiments, it is estimated that 75%, 50% and 25% of the females came to the age of 40 to 42 days, 50 to 52 days and 56 to 58 days, respectively. It was verified that both humidity variation were significantly different to the first and last weeks, both in 2004 and 2005 respectively. It is concluded that the humidity in the first semester of the year, occasioned a longer lifetime of the aedes aegypti in the rainy season than in the non-rainy season, given that the mosquitoes live longer in a more humid air than a drier air and females survive sufficient time to cross the period of incubation and transmit the virus, it means, the lifetime gained by the females of Aedes aegypti of Fortaleza gives them a high vector capacity.

ASSUNTO(S)

aedes aegypti capacidade vetorial longevidade umidade relativa do ar saude publica aedes aegypti capacity vectorial longevity humidity

ACESSO AO ARTIGO

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