Community implementation of human landing and nonhuman landing collection methods for Wuchereria bancrofti vectors

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Résumé

In the drive towards elimination of lymphatic filariasis, enhanced surveillance of vector mosquitoes
requires sound sampling methods which can be easily implemented and accepted by communities.
Several tools have been validated as alternatives to human landing catches (HLC) for this purpose, but
little is known about their effectiveness compared to HLC in terms of the vector density patterns. This
study aimed at assessing the efficiency of four mosquitoes collecting tools (HLC, Center for Diseases
Control (CDC) light trap, Double Net trap, Window Exit trap). These four sampling tools were evaluated
in three different villages (Bapla, Ouessa and Koudjo) in Burkina Faso, when mosquito collection was
managed by local people in each community. The results showed that HLC remained the most effective
collection method in terms of vector abundance in all villages, followed by double net traps. Except in
Bapla, the double net trap collected more Anopheles than CDC light traps. Across the study, the
prevalence of Wuchereria bancrofti infection was estimated to be 0.6% and observed only in Anopheles
gambiae sensu stricto. The Double Net trap is the least expensive of all three methods and was well
accepted by the community. In conclusion, double net traps can be recommended for communities to
use for lymphatic filariasis (LF) vector surveillance program for xeno-monitoring of post transmission
assessment survey evaluation. Based on prevalence the mass drug administration (MDA) could be
stopped in these villages without risk of resurgence of the disease, according to the current
recommendations of World Health Organization (WHO). Set up surveillance and continue to use vector
control tools.

Mots-clés

Lymphatic filariasis, Wuchereria bancrofti, mosquitoes, community surveillance, Burkina Faso