scholarly journals Improved Use of Drone Imagery for Malaria Vector Control through Technology-Assisted Digitizing (TAD)

2022 ◽  
Vol 14 (2) ◽  
pp. 317
Author(s):  
Andy Hardy ◽  
Gregory Oakes ◽  
Juma Hassan ◽  
Yussuf Yussuf
Keyword(s):  
Vector Control ◽  
Malaria Vector ◽  
Supervised Classification ◽  
Region Growing ◽  
Malaria Vector Control ◽  
Larval Habitats ◽  
Classification Approach ◽  
Spatial Intelligence ◽  
Supervised Image Classification ◽  
Complex Features

Drones have the potential to revolutionize malaria vector control initiatives through rapid and accurate mapping of potential malarial mosquito larval habitats to help direct field Larval Source Management (LSM) efforts. However, there are no clear recommendations on how these habitats can be extracted from drone imagery in an operational context. This paper compares the results of two mapping approaches: supervised image classification using machine learning and Technology-Assisted Digitising (TAD) mapping that employs a new region growing tool suitable for non-experts. These approaches were applied concurrently to drone imagery acquired at seven sites in Zanzibar, United Republic of Tanzania. Whilst the two approaches were similar in processing time, the TAD approach significantly outperformed the supervised classification approach at all sites (t = 5.1, p < 0.01). Overall accuracy scores (mean overall accuracy 62%) suggest that a supervised classification approach is unsuitable for mapping potential malarial mosquito larval habitats in Zanzibar, whereas the TAD approach offers a simple and accurate (mean overall accuracy 96%) means of mapping these complex features. We recommend that this approach be used alongside targeted ground-based surveying (i.e., in areas inappropriate for drone surveying) for generating precise and accurate spatial intelligence to support operational LSM programmes.

Monitoring of Larval Habitats and Mosquito Densities in the Sudan Savanna of Mali: Implications for Malaria Vector Control

2007 ◽  
Vol 77 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Nafomon Sogoba ◽  
Thomas Smith ◽  
Sékou F. Traoré ◽  
José M. C. Ribeiro ◽  
Abdoulaye Touré ◽  
...  
Keyword(s):  
Vector Control ◽  
Malaria Vector ◽  
Malaria Vector Control ◽  
Larval Habitats ◽  
Sudan Savanna

scholarly journals Testing a pyriproxyfen auto-dissemination station attractive to gravid Anopheles gambiae sensu stricto for the development of a novel attract-release -and-kill strategy for malaria vector control

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Oscar Mbare ◽  
Steven W. Lindsay ◽  
Ulrike Fillinger
Keyword(s):  
Vector Control ◽  
Anopheles Gambiae ◽  
Malaria Vector ◽  
Sensu Stricto ◽  
Insect Growth Regulator ◽  
Malaria Vector Control ◽  
Larval Habitats ◽  
Bait Station ◽  
Late Instar ◽  
Gravid Females

Abstract Background Larviciding is an effective supplementary tool for malaria vector control, but the identification and accessibility of aquatic habitats impedes application. Dissemination of the insect growth regulator, pyriproxyfen (PPF), by gravid Anopheles might constitute a novel application strategy. This study aimed to explore the feasibility of using an attractive bait-station to contaminate gravid Anopheles gambiae sensu stricto with PPF and subsequently transfer PPF to larval habitats. Methods A bait-station was developed comprising of an artificial pond containing water treated with 20 ppm cedrol, an oviposition attractant, and a netting-cover treated with PPF. Three identical semi-field cages were used to assess the potential of gravid Anopheles to transfer PPF from the bait-station to ponds. Gravid females were released in two semi-field cages, one with PPF on its bait-station (test) and one without PPF (control). No mosquitoes were released in the third cage with a PPF-treated station (control). Transfer of PPF to open ponds was assessed by monitoring emergence of late instar insectary-reared larvae introduced into the ponds. The amount of PPF carried by a mosquito and transferred to water was quantified using liquid chromatography-mass spectrometry. Results In the controls, 86% (95% CI 81–89%) of larvae introduced into open ponds developed into adults, indicating that wind did not distribute PPF in absence of mosquitoes. Emergence inhibition was observed in the test cage but was dependent on the distance between pond and bait-station. Only 25% (95% CI 22–29%) of larvae emerged as adults from ponds 4 m from the bait-station, but 92% (95% CI 89–94%) emerged from ponds 10 m away. Each mosquito was contaminated on average with 112 μg (95% CI 93–123 μg) PPF resulting in the transfer of 230 ng/L (95% CI 180–290 ng/L) PPF to 100 ml volumes of water. Conclusions The bait-stations successfully attracted gravid females which were subsequently dusted with effective levels of PPF. However, in this study design, attraction and dissemination was limited to short distances. To make this approach feasible for malaria vector control, stronger attractants that lure gravid females from longer distances, in landscapes with many water bodies, and better PPF delivery systems are needed.

scholarly journals Integrity, use and care of long-lasting insecticidal nets in Kirinyaga County, Kenya

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mary Nyangi ◽  
Elizabeth Kigondu ◽  
Beatrice Irungu ◽  
Margaret Nganga ◽  
Anthony Gachanja ◽  
...  
Keyword(s):  
Physical Examination ◽  
Vector Control ◽  
Malaria Vector ◽  
Standard Procedure ◽  
Bed Nets ◽  
Malaria Vector Control ◽  
Systematic Sampling ◽  
Significant Difference ◽  
Household Heads ◽  
Long Lasting Insecticidal Nets

Abstract Background Vector control is an essential component in prevention and control of malaria in malaria endemic areas. Insecticide treated nets is one of the standard tools recommended for malaria vector control. The objective of the study was to determine physical integrity and insecticidal potency of long-lasting insecticidal nets (LLINs) used in control of malaria vector in Kirinyaga County, Kenya. Method The study targeted households in an area which had received LLINs during mass net distribution in 2016 from Ministry of Health. A total of 420 households were sampled using systematic sampling method, where the household heads consented to participate in the study. A semi-structured questionnaire was administered to assess care and use while physical examination was used to determine integrity. Chemical concentration was determined by gas chromatography mass spectroscopy (GC-MS). Data analysis was done using Statistical Package for Social Sciences (SPSS) version 19. Results After 18 months of use, 96.9% (95% CI: 95.2–98.6%) of the distributed nets were still available. Regarding net utilization, 94.1% of household heads reported sleeping under an LLIN the previous night. After physical examination, 49.9% (95% CI: 43–52.8%) of the bed nets had at least one hole. The median number of holes of any size was 2[interquartile range (IQR) 1–4], and most holes were located on the lower part of the nets, [median 3 (IQR 2–5)]. Only 15% of the nets with holes had been repaired. The median concentration for α-cypermethrin was 7.15 mg/m2 (IQR 4.25–15.31) and 0.00 mg/g (IQR 0.00–1.99) for permethrin. Based on pHI, Chi-square test varied significantly with the manufacturer (X (6, N = 389) = 29.14, p = 0.04). There was no significant difference between nets with different number of washes (X2(2) = 4.55, p = 0.103). Conclusion More than three-quarters of the nets supplied had survived and insecticidal potency was adequate in vector control. Standard procedure for field evaluation of surface insecticidal content available to a mosquito after landing on a net to rest is recommended.

scholarly journals Susceptibility of Anopheles gambiae to insecticides used for malaria vector control in Rwanda

2016 ◽  
Vol 15 (1) ◽  
Author(s):  
Emmanuel Hakizimana ◽  
Corine Karema ◽  
Dunia Munyakanage ◽  
Gad Iranzi ◽  
John Githure ◽  
...  
Keyword(s):  
Vector Control ◽  
Anopheles Gambiae ◽  
Malaria Vector ◽  
Malaria Vector Control
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