Relationship to human biting collections and influence of light and bednet in CDC light-trap catches of West African malaria vectors

被引:58
作者
Costantini, C
Sagnon, NF
Sanogo, E
Merzagora, L
Coluzzi, M
机构
[1] Ctr Natl Lutte Contre Paludisme, Ouagadougou 01, Burkina Faso
[2] Univ Roma La Sapienza, WHO Collaborating Ctr, Inst Parasitol, I-00185 Rome, Italy
[3] Univ London Imperial Coll Sci Technol & Med, Dept Biol, London, England
关键词
D O I
10.1017/S000748530002602X
中图分类号
Q96 [昆虫学];
学科分类号
摘要
The efficiency of miniature CDC light-traps in catching West African malaria vectors was evaluated during two rainy seasons in a village near Ouagadougou, Burkina Faso. Traps were employed both indoors and outdoors using human baits protected by an insecticide-free mosquito-net and different sources of light. Indoors, light from incandescent bulbs increased the catch of Anopheles gambiae s.l. (mainly A. arabiensis Patton and the Mopti chromosomal form of A. gambiae s.s. Giles) and A. funestus Giles c. 2.5 times as compared to traps whose light bulb was removed. Conversely, the difference was not significant when a UV 'Blacklight-blue' fluorescent tube was compared to the incandescent bulb. Protecting the bait with a mosquito-net increased the catch c. 3 times for A. gambiae s.l. and c. 3.5 times for A, funestus. A prototype model of double bednet gave intermediate yields. Outdoors, the addition of incandescent bulbs to unlighted traps did not significantly increase the number of vectors caught, but the addition of the mosquito-net to the unprotected human bait did so by c. 1.5-4 times. Thus, the CDC light-trap hung close to a human sleeping under a bednet and fitted with an incandescent bulb, was considered the most practical and efficient in terms of numbers of vectors caught, consequently its indoor efficiency was compared to human landing catches on single collectors and estimated to be 1.08 times and density-independent. Outdoor light-trap catches were either not significantly correlated to biting collections (as for A, gambiae s.l.), or density-dependent in their efficiency (as for A. funestus); thus, they were not considered a reliable means for estimating malaria vector outdoor biting densities in this area. No difference was found in the parous rate of A. gambiae s.l. samples obtained with CDC light-traps and human landing collections.
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页码:503 / 511
页数:9
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