Using pastoralist community knowledge to locate and treat dry-season mosquito breeding habitats with pyriproxyfen to control Anopheles gambiae s.l. and Anopheles funestus s.l. in rural Tanzania
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Date
2021-01-06
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Nature
Abstract
Fundamentally, larviciding with pyriproxyfen (PPF) has potential to complement Long Lasting
Insecticide Nets (LLINs) and indoor residual sprays (IRS) in settings where resistance to
pyrethroids and residual malaria transmission exist. In this study, we evaluated the field
effectiveness of larviciding using PPF to reduce dry season productivity of mosquito breeding
habitats that were located by pastoralists within the study area. Using pastoralist knowledge, dry
season breeding habitats in Mofu village rural Tanzania were located and monitored for larval
productivity for a period of 8 months before PPF intervention. During the intervention, six out of
twelve breeding habitats were treated with Sumilarv 0.5G PPF granules. The impact of deposited
PPF was monitored by recording emergence inhibition of larvae collected from treated habitats
compared to the appropriate control group for a period of three months and half post-intervention.
During baseline, the average proportion (+SD) of adult emerged was similar between two clusters,
with (0.89 + 0.22) for the control cluster and (0.93 + 0.16) for the treatment cluster of breeding
habitats. Following treatment with PPF, the average proportion (+SD) of adult emerged in the
treated breeding habitats was significantly low (0.096 + 0.22) compared to adults that emerged
from larvae in the untreated habitats (0.99 + 0.22) (p < 0.0001). Of all emerged adults,
approximately 94% were An. gambiae s.l. and the remaining 6% were An. funestus s.l. This is the
first study demonstrating the usefulness of engaging pastoralist community to locate and identify
hard to find mosquito breeding habitats. Reduced productivity of the targeted habitats with PPF
offers prospect of implementing PPF larviciding in dry season when habitats are few and
permanent to control mosquito population in rural settings.
Sustainable Development Goals
SGD-2: Zero Hunger
Keywords
Pastoralists, Larviciding, Pyriproxyfen, Dry-seasons, Malaria vectors, Rural Tanzania