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Melachio, Tresor, Bouaka Tsakeng, Calmes Ursain, Tirados, Inaki 
ORCID: https://orcid.org/0000-0002-9771-4880, Acho, Alphonse, Bigoga, Jude, Wondji, Charles ORCID: https://orcid.org/0000-0003-0791-3673 and Njiokou, Flobert
(2023)
'Impact of a small-scale tsetse fly control operation with deltamethrin impregnated “Tiny Targets” on tsetse density and trypanosomes’ circulation in the Campo sleeping sickness focus of South Cameroon'. PLOS Neglected Tropical Diseases, Vol 17, Issue 11, e0011802.
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pntd.0011802.pdf - Published Version Available under License Creative Commons Attribution. Download (1MB) | Preview |
Abstract
Background:
Significant progress has been made towards African sleeping sickness elimination in the last decade. Indeed, the World Health Organization (WHO) global goal of eliminating the chronic form of the disease as a public health problem was achieved in 2020 (i.e., < 2,000 new cases per year). Vector control has played an important role in achieving this goal. In this study, we evaluated the impact of the insecticide impregnated Tiny Targets on tsetse fly densities and their infection rates with Trypanosoma spp in the Campo sleeping sickness focus of South Cameroon.
Methods:
The study site was divided into two areas: (i) the south-west experimental area, which included vector control, and (ii) the eastern part as the non-intervention area. After compiling the baseline entomological data (tsetse densities and trypanosome infection rates), around 2000 Tiny Targets were deployed in the South-West area and replaced every six months for two years. Post-intervention surveys were conducted every six months to determine tsetse densities and levels of trypanosome infections with PCR-based methods.
Results:
Following the intervention, tsetse mean catches decreased by 61% after six months, and up to 73% after twelve months (pre-intervention: 2.48 flies/trap/day, 95%CI [1.92–3.14]; 12-months post-intervention: 0.66 tsetse/trap/day, 95%CI [0.42–0.94]). This decrease was not sustained after 18 months, and the mean catch doubled compared to that after 12 months. After 24 months, the mean catches still increased by 17% (18 months: 1.45 tsetse/trap/day, 95%CI [1.07–1.90] and 24 months: 1.71 tsetse/trap/day, 95%CI [1.27–2.24]). In the non-intervention area, a variation in tsetse catches was observed during the two years, with a general increase from 2.43 [0.73–5.77] to 3.64 [1.47–7.70] tsetse/trap/day. In addition, trypanosome infection rates dropped by 75% in both areas (P-value < 0.001) from 21.20% to 5.06% and from 13.14% to 3.45% in intervention and control areas respectively.
Conclusion:
Tiny targets have proven useful in reducing tsetse population densities and trypanosome infection rates, providing evidence for the integration of this tool in current strategies towards trypanosomiasis elimination in Campo. The non-sustained decrease of tsetse densities after one year may indicate reinvasions from neighbouring breeding sites or that the intervention area was not large enough. Our results show the need to scale up by accessing difficult breeding sites and extend the tiny targets to the whole transborder focus.
| Item Type: | Article |
|---|---|
| Subjects: | QX Parasitology > Insects. Other Parasites > QX 650 Insect vectors WC Communicable Diseases > Tropical and Parasitic Diseases > WC 705 Trypanosomiasis |
| Faculty: Department: | Biological Sciences > Vector Biology Department |
| Digital Object Identifer (DOI): | https://doi.org/10.1371/journal.pntd.0011802 |
| SWORD Depositor: | JISC Pubrouter |
| Depositing User: | JISC Pubrouter |
| Date Deposited: | 08 Dec 2023 15:56 |
| Last Modified: | 08 Dec 2023 15:56 |
| URI: | https://archive.lstmed.ac.uk/id/eprint/23642 |
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