Identification of the best ovitrap installation sites for gravid Aedes (Stegomyia) aegypti in residences in Mirassol, state of São Paulo, Brazil.

This study aimed at identifying the best ovitrap installation sites for gravid Aedes aegypti in Mirassol, state of São Paulo, Brazil. Ovitraps were installed in ten houses per block over ten blocks. Four ovitraps were placed per residence, one in the bedroom, one in the living room, and two outdoors with one in a sheltered area and one in an outside site. Each week for eleven weeks, visits were made to examine the ovitraps and to change the paddles used for egg-laying. Eggs were analyzed according to the trap location. The results showed that the outdoor sites received significantly more oviposition than indoor sites. Additionally, in respect to the outdoor sites, the outside site received significantly more oviposition than the sheltered site. A strong correlation was observed between positive traps and egg numbers. The results are discussed with respect to the best installation site of the traps and their implications in surveillance and control of dengue vectors.

Identification of the best ovitrap installation sites for gravid Aedes (Stegomyia) aegypti in residences in Mirassol, state of São Paulo, Brazil

This study aimed at identifying the best ovitrap installation sites for gravid Aedes aegypti in Mirassol, state of São Paulo, Brazil. Ovitraps were installed in ten houses per block over ten blocks. Four ovitraps were placed per residence, one in the bedroom, one in the living room, and two outdoors with one in a sheltered area and one in an outside site. Each week for eleven weeks, visits were made to examine the ovitraps and to change the paddles used for egg-laying. Eggs were analyzed according to the trap location. The results showed that the outdoor sites received significantly more oviposition than indoor sites. Additionally, in respect to the outdoor sites, the outside site received significantly more oviposition than the sheltered site. A b correlation was observed between positive traps and egg numbers. The results are discussed with respect to the best installation site of the traps and their implications in surveillance and control of dengue vectors.

Controle do vetor do dengue e participação da comunidade em Catanduva, São Paulo, Brasil / Dengue vector control and community participation in Catanduva, São Paulo State, Brazil

O trabalho teve o objetivo de identificar mudanças de conhecimentos e práticas de prevenção do dengue, e desenvolveu-se em duas áreas de Catanduva: Area de Estudo e Area Controle. Realizaram-se, entre 1999 e 2001, levantamentos quantitativo inicial e qualitativo; diagnóstico preliminar, apresentado à comunidade da Area de Estudo, desencadeando discussão para a definição e o direcionamento das ações; o desenvolvimento das ações na Area de Estudo, com a participação da comunidade; continuidade das atividades de rotina na Area Controle; e avaliação final. Na Area de Estudo, as ações realizadas foram: mudança do trabalho dos agentes de controle de vetores que passaram a demonstrar as medidas preventivas, sem a retirada de recipientes e sem utilização de larvicida; utilização de material educativo específico à realidade local; atividades relacionadas às prioridades dos moradores; atividades como música, teatro, gincanas e brincadeiras; demonstração do ciclo do vetor. Como resultado, houve a diminuição significante do número de recipientes por casa; o aumento significante da proporção de casas sem recipientes; e o aumento significante da proporção de pessoas que reconheceram as larvas do vetor na Area de Estudo em relação à de Controle.

[Dengue vector control and community participation in Catanduva, São Paulo State, Brazil]. / Controle do vetor do dengue e participação da comunidade em Catanduva, São Paulo, Brasil.

This study aimed to identify changes in knowledge and practices learned to prevent dengue fever in two areas of Catanduva, São Paulo State, from 1999 to 2001: a study area and a control area. The study included an initial quantitative survey, qualitative research, a preliminary diagnosis presented to the community to launch a discussion aimed at defining future actions, implementation of the actions in the study area with community participation (but without changes in the control area), and a final comparison of the two areas. Changes in the study area included: vector control workers began demonstrating preventive measures without removing potential breeding places or using larvicide; use of educational aids specific to the local reality; activities related to the residents priorities; and activities such as music, theater skits, scavenger hunts, and games to demonstrate the vector cycle. Potential domiciliary breeding sites were significantly reduced; the proportion of houses without breeding sites was significantly increased; and there was an increase in the percentage of individuals who recognized the larval form of the vector in the study area as compared to the control area.

[Aedes albopictus (S) in the region of São José do Rio Preto, SP, Brazil: a study of its infestation in an area where Aedes aegypti was already established and a discussion of its role as a possible vector of dengue and yellow fever]. / Aedes albopictus (S) na região de São José do Rio Preto, SP: estudo da sua infestação em área já ocupada pelo Aedes aegypti e discussão de seu papel como possível vetor de dengue e febre amarela.

The objectives of this survey were to study the evolution of Aedes albopictus infestation in São José do Rio Preto region, SP, an area already occupied by Aedes aegypti and also to discuss its role in transmitting diseases. Analyzing data from urban mosquito larval density surveys of the region's municipalities, year and site of the occurrence, composition and location of larval samples, breeding containers and Breteau indices were studied. By May 2001, the vector was found in 96 of 100 municipalities. Aedes albopictus compared with Aedes aegypti was found in greater proportions close to dwellings and presented greater degrees of association in natural and discarded containers. Endemic behavior of dengue, occurrences of local cases of sylvatic yellow fever and recognized competence of the vector's transmission of these diseases suggest the necessity to consider its possible participation in the transmission of dengue and the re-urbanization of yellow fever.

Aedes albopictus (S) na região de São José do Rio Preto, SP: estudo da sua infestação em área já ocupada pelo Aedes aegypti e discussão de seu papel como possível vetor de dengue e febre amarela / Aedes albopictus (S) in the region of São José do Rio Preto, SP, Brazil: a study of its infestation in an area where Aedes aegypti was already established and a discussion of its role as a possible vector of dengue and yellow fever

The objectives of this survey were to study the evolution of Aedes albopictus infestation in São José do Rio Preto region, SP, an area already occupied by Aedes aegypti and also to discuss its role in transmitting diseases. Analyzing data from urban mosquito larval density surveys of the region's municipalities, year and site of the occurrence, composition and location of larval samples, breeding containers and Breteau indices were studied. By May 2001, the vector was found in 96 of 100 municipalities. Aedes albopictus compared with Aedes aegypti was found in greater proportions close to dwellings and presented greater degrees of association in natural and discarded containers. Endemic behavior of dengue, occurrences of local cases of sylvatic yellow fever and recognized competence of the vector's transmission of these diseases suggest the necessity to consider its possible participation in the transmission of dengue and the re-urbanization of yellow fever.

Avaliaçäo de açöes municipais de combate a vetores da dengue na regiäo de Säo José do Rio Preto, Säo Paulo, 1989 a 1995 / Municipal activities against dengue vectors: a survey in the region of Säo José do Rio Preto, Säo Paulo, 1989-1995

O objetivo do trabalho é medir as coberturas das atividades municipais de controle de Aedes aegypti e/ou Aedes albopictus, o casa-casa e o arrastäo, realizadas entre 1989 e 1995 na regiäo de Säo José do Rio Preto, Säo Paulo e avaliar a correlaçäo cruzada entre elas e os Indices de Breteau (IB). Para os municípios com até 50.000 imóveis as coberturas conjuntas das atividades casa-casa e arrastäo foram em sua maioria adequadas e as coberturas do casa-casa apresentaram correlaçäo cruzada negativa com os IB. Para município sede (maior que 50.000 imóveis) essas coberturas näo apresentaram correlaçäo com os IB. Em geral as coberturas foram inversamente proporcionais ao tamanho dos municípios. Para todas as faixas de tamanho de municípios, os arrastöes näo apresentaram correlaçäo com os IB, mostrando-se ineficazes