RESUMO
The dengue vectors Aedes aegypti and Ae. albopictus were surveyed within the city of Manila from August 1985 to July 1987. Survey techniques included ovitraps, indoor resting collections, Fay traps, and larval surveys. Aedes aegypti was the principal container breeder within the residential areas, while Ae. albopictus predominated in cemeteries. The ovitrap was very effective in detecting the presence of Ae. aegypti, but not in measuring population changes during the year. Indoor resting and Fay traps show a low population of Ae. aegypti from February through May, during the dry season, and higher populations from June through September, during the rainy season. The most common indoor containers holding larvae were flower vases, while metal or glass containers were the most common outdoors. Dengue transmission appears to be closely related to rainfall, with cases increasing about 2 months following the onset of the rainy season.
Assuntos
Animais , Anopheles/microbiologia , Dengue/transmissão , Vírus da Dengue , Ecologia , Insetos Vetores/microbiologia , Filipinas , Dinâmica Populacional , Estações do AnoRESUMO
Mosquitos were collected in three villages on the western coast of the island of Palawan, Republic of the Philippines, from June 1986 to April 1987, using 3 methods. Anopheles flavirostris, the primary malaria vector, was the most abundant of the Anopheles collected biting man, ranging from a low of 83.9% in June (16.1 collected/man/night) to 98.3% in April (29.1 collected/man/night). The number of species was greatest in the animal-baited traps with 54 species detected. The CO2-baited CDC light traps were neither effective nor economically feasible as a monitoring tool for malaria vectors at this site. People were at risk from An. flavirostris bites throughout the night except 1800-2000 which are low-risk hours. Anopheles flavirostris is slightly exophagic during most of the year, but moderately endophagic during the hot, dry season.
Assuntos
Animais , Anopheles , Comportamento Animal , Culex , Culicidae , Filipinas , Densidade Demográfica , Vigilância da População , Estações do AnoRESUMO
Fifty-one species of mosquitos were collected at a malarious site in western Palawan, Philippines. Anopheles flavirostris, which is the primary malaria vector, was mildly exophagic and zoophilic, and had a peak biting activity from 0030-0130 hours. An. balabacensis, a secondary vector, was endophagic, anthropophilic, and was primarily active between 2000-0030. Of the 3 main genera, Culex were the most zoophilic, Aedes were the most anthropophilic, and Anopheles had species in both extremes. An. annularis, Ae. vexans, and Cx. vishnui showed similar biting activity patterns during both the rainy or dry seasons.
Assuntos
Animais , Búfalos , Culicidae , Reservatórios de Doenças , Comportamento Alimentar , Interações Hospedeiro-Parasita , Humanos , Mordeduras e Picadas de Insetos/epidemiologia , Insetos Vetores , Malária/transmissão , Filipinas/epidemiologia , Densidade Demográfica , Estações do Ano , Especificidade da EspécieRESUMO
The effect of nearby animals on man-biting rates was tested under both outdoor and indoor conditions. Under outdoor conditions, fewer mosquitoes were found biting man when a carabao was nearby than when none were close. When collecting indoors, the opposite results were obtained. Therefore, placing a carabao near a house is disadvantageous. Sporozoite rates of Anopheles flavirostris were twice as high from man-biting collections as those caught from carabao. Placing carabao around a village but away from the house could play a significant role in reducing malaria transmission.
Assuntos
Animais , Anopheles/parasitologia , Apicomplexa/isolamento & purificação , Búfalos , Humanos , Mordeduras e Picadas de Insetos/prevenção & controle , Controle de Insetos/métodos , Malária/prevenção & controle , FilipinasRESUMO
The islands of Batan and Rapu Rapu in southeastern Luzon, Philippines, were surveyed for filariasis from November 1984 to May 1985. Microfilariae of Bancroftian filariasis were detected in 10.5% of the people over one year of age. Microfilarial rates and intensity of infection were the same for males and females. The highest rates for both sexes were in the 56- to 60-year-old age group. Aedes poicilius, which breeds in abaca and banana plants, was found to be very anthropophilic, comprising 96.5% of the mosquitoes biting man. This mosquito bites most frequently in the middle of the night. Dissections showed that 1.0% of Ae. poicilius were infective with third-stage larvae, and each infective mosquito contained a mean average of 5.6 larvae.