We started a first series of Eave Tube demonstrations in the village of Igombati (Kilombero valley, Tanzania) and installed the Eave Tubes in 23 local houses. In these tests we monitored the indoor climate and mosquito densities to measure how mosquito-proof we can make local house types without reducing ventilation.
Furthermore, we started persistence tests in Igombati. We placed insecticide-treated and fungus-treated gauze samples inside the Eave Tubes and monitored their efficacy over time. Each month, pieces of gauze are being removed and tested on mosquitoes using standard WHO exposures. Bendiocarb- and deltamethrin dusted gauze have remained active (100% kill) after 7 months, and more persistence tests are ongoing.
Village-scale trial with Eave Tubes
We started with a field trial in the rural village of Lukolongo (Kilombero valley, Tanzania) to demonstrate Eave tube impact in a village-scale trial (1200 households) and obtain information on operational costs and user acceptance for further product optimisations.
Several village meetings were held to get approval for the activities and to ensure full community participation. All 1200 houses are being georeferenced; the listing off all house types and their exact locations. A protocol for the demonstration studies (mosquito monitoring) and data collection has been drafted.
We appointed an operational field manager to execute the village demo trial and to oversee Eave tube installations. All required materials, including 13.000 PVC tubes, 15.000 m2 of polyester gauze coated with the electrostatic coating were ordered and transported to the field sites. Eave Tube placement has commenced in July 2014 with a team of local construction workers and currently (early August 2014) 50 houses have been finalised.
First field results
Eave Tube instalment includes sealing off the entire eave space and wall openings, inserting 12 tubes per house with insecticide-dusted gauze and sealing the windows with untreated gauze. With the doors closed at night, this mosquito proofing of the house has been shown to reduce the numbers of indoor mosquitoes with more than 85%.
During the field trial, we will measure indoor reductions in several house types and monitor mosquito population sizes over time. We will compare the test site with a control village. We closely monitor the time and costs needed per house to get a good view of operational requirements and to optimise the product for future upscaled roll outs.