Testing a method of sampling for entomological determination of transmission of Wuchereria bancrofti to inform lymphatic filariasis treatment strategy in urban settings

Table 4 Description of sub-optimal collection conditions

Trap types	Malfunction	Participant action	Weather
Gravid	Issues with the batteries where they ran out of power or were old, meaning the fan was running slowly or intermittently or not running by the time the team arrived	Traps were damaged by animals (goats, sheep) present on people’s properties, usually resulting to trap malfunction due to fan stopping because of disconnection or collapse of the whole trap structure	Strong winds and rains caused water to fill the basins. These caused fans to stop running and prevented entry of more mosquitoes into the trap as well as damaged attractant in the traps
	Disconnected battery
	Fan running in the opposite direction pushing mosquitoes downward. This indicates that the traps were assembled incorrectly
Exit	Spiders inside the trap could have eaten mosquitoes	Nobody slept in the room (usually due to heat) meaning mosquitoes would have been less likely to enter the room	Strong winds detached some traps from the window
Exit	Spiders inside the trap could have eaten mosquitoes	People slept under bednets preventing mosquito bites	Strong winds detached some traps from the window
PSC		Nobody slept in the room meaning mosquitoes would have been less likely to enter the room and/or resting there
		People slept under bednets meaning mosquitoes potentially would fail to bite and/or go to rest
		Use of coil/insecticides reduced the number of mosquitoes in and around the house
		Some doors/windows were opened on arrival. As a result, mosquitoes would have been able to escape

ISSN: 1756-3305