Press release: 1400 households, 450 Biogents traps, uncounted dengue mosquitoes – a long-term study in Brazil

Written by Ingeborg Schleip April 27th, 2014

Regensburg 2014/03/27 – Dengue fever is widely distributed in Brazil and other tropical and subtropical regions and a constant threat to the local population. Dengue is mosquito-borne virus that infects up to 100 million people each year. Because there is no effective vaccine available, the only way to control the disease is by controlling the dengue mosquitoes. While the use of conventional insecticides is widespread, they have become increasingly ineffective due to insecticide resistance.

A new approach to control the mosquitoes could be the mosquito trap developed by Biogents. A large-scale study published in the Entomological Society of America’s Journal of Medical Entomology has demonstrated for the first time that these traps can also reduce the number of dengue mosquitoes (Aedes aegypti) in a broad urban area. The study co-financed by the world-bank was conducted over 18 months with more than 1400 households and 450 Biogents traps in Manaus, Brazil.

The result: „The study shows that the Biogents traps can significantly reduce the amount of adult female Aedes aegypti especially in the rainy season” says Prof. Eiras from the University Federal de Minas Gerais (Brazil). The number of dengue infections in the test areas also decreased. An additional advantage for household trap users was the Biogents traps also reduced numbers of the annoying and often numerous tropical house mosquito (Culex quinquefasciatus). Households that used the traps reported a noticeable reduction in the nuisance from mosquitoes. Additional studies will be required to investigate the effects of trapping on larger scales and during epidemics.

Degener et al, 2014: Evaluation of the Effectiveness of Mass Trapping With BG-Sentinel Traps for Dengue Vector Control: A Cluster Randomized Controlled Trial in Manaus, Brazil, J. Med. Entomol. 51(2): 000Ð000 (2014); DOI:

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