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Modelling habitat suitability of the invasive tick Rhipicephalus microplus in West Africa

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Abstract
Ticks have medical and economic importance due to their ability to transmit pathogens to humans and animals. In tropical and sub-tropical countries, tick-borne diseases (TBD) are among the most important diseases affecting livestock and humans. The fast spread of ticks and TBD requires a quick development and application of efficient prevention and/or control programs. Therefore, prior investigations on TBD and related vectors epidemiology, for instance, through accurate epidemiological models, are mandatory. This study aims to develop models to forecast suitable habitat for Rhipicephalus microplus distribution in West Africa. Tick occurrences were assembled from 10 different studies carried out in six West African countries in the past decade. Six statistical models (maximum entropy in a single model and generalised linear model, generalised additive model, random forest, boosted regression tree and support vector machine model in an ensemble model) were applied and compared to predict the habitat suitability of R. microplus distribution in West Africa. Each model was evaluated with the area under the receiver operating characteristic curve (AUC), the true skill statistic (TSS) and the Boyce index (BI). The selected models had good performance according to their AUC (above .8), TSS (above .7) and BI (above .8). Temperature played a key role in MaxEnt model, whereas normalised difference vegetation index (NDVI) was the most important variable in the ensemble model. The model predictions showed coastal countries of West Africa as more suitable for R. microplus. However, some Sahelian areas seems also favourable. We stress the importance of vector surveillance and control in countries that have not yet detected R. microplus but are in the areas predicted to host suitable habitat. Indeed, awareness-raising and training of different stakeholders must be reinforced for better prevention and control of this tick in these different countries according to their status.
Keywords
General Veterinary, General Immunology and Microbiology, General Medicine, boosted regression tree, ensemble modelling, generalised additive model, generalised linear model, maximum entropy, random forest, Rhipicephalus microplus, support vector machine, West Africa, SPECIES DISTRIBUTION MODELS, BOOPHILUS-MICROPLUS, CATTLE TICK, GEOGRAPHIC-DISTRIBUTION, ACARI IXODIDAE, DISTRIBUTIONS, ACCURACY, RESOURCE, MAXENT, SPREAD

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MLA
Zannou, Olivier M., et al. “Modelling Habitat Suitability of the Invasive Tick Rhipicephalus Microplus in West Africa.” TRANSBOUNDARY AND EMERGING DISEASES, vol. 69, no. 5, 2022, pp. 2938–51, doi:10.1111/tbed.14449.
APA
Zannou, O. M., Da Re, D., Ouedraogo, A. S., Biguezoton, A. S., Abatih, E., Yao, K. P., … Saegerman, C. (2022). Modelling habitat suitability of the invasive tick Rhipicephalus microplus in West Africa. TRANSBOUNDARY AND EMERGING DISEASES, 69(5), 2938–2951. https://doi.org/10.1111/tbed.14449
Chicago author-date
Zannou, Olivier M., Daniele Da Re, Achille S. Ouedraogo, Abel S. Biguezoton, Emmanuel Abatih, Kouassi Patrick Yao, Souaïbou Farougou, Laetitia Lempereur, Sophie O. Vanwambeke, and Claude Saegerman. 2022. “Modelling Habitat Suitability of the Invasive Tick Rhipicephalus Microplus in West Africa.” TRANSBOUNDARY AND EMERGING DISEASES 69 (5): 2938–51. https://doi.org/10.1111/tbed.14449.
Chicago author-date (all authors)
Zannou, Olivier M., Daniele Da Re, Achille S. Ouedraogo, Abel S. Biguezoton, Emmanuel Abatih, Kouassi Patrick Yao, Souaïbou Farougou, Laetitia Lempereur, Sophie O. Vanwambeke, and Claude Saegerman. 2022. “Modelling Habitat Suitability of the Invasive Tick Rhipicephalus Microplus in West Africa.” TRANSBOUNDARY AND EMERGING DISEASES 69 (5): 2938–2951. doi:10.1111/tbed.14449.
Vancouver
1.
Zannou OM, Da Re D, Ouedraogo AS, Biguezoton AS, Abatih E, Yao KP, et al. Modelling habitat suitability of the invasive tick Rhipicephalus microplus in West Africa. TRANSBOUNDARY AND EMERGING DISEASES. 2022;69(5):2938–51.
IEEE
[1]
O. M. Zannou et al., “Modelling habitat suitability of the invasive tick Rhipicephalus microplus in West Africa,” TRANSBOUNDARY AND EMERGING DISEASES, vol. 69, no. 5, pp. 2938–2951, 2022.
@article{8759508,
  abstract     = {{Ticks have medical and economic importance due to their ability to transmit pathogens to humans and animals. In tropical and sub-tropical countries, tick-borne diseases (TBD) are among the most important diseases affecting livestock and humans. The fast spread of ticks and TBD requires a quick development and application of efficient prevention and/or control programs. Therefore, prior investigations on TBD and related vectors epidemiology, for instance, through accurate epidemiological models, are mandatory. This study aims to develop models to forecast suitable habitat for Rhipicephalus microplus distribution in West Africa. Tick occurrences were assembled from 10 different studies carried out in six West African countries in the past decade. Six statistical models (maximum entropy in a single model and generalised linear model, generalised additive model, random forest, boosted regression tree and support vector machine model in an ensemble model) were applied and compared to predict the habitat suitability of R. microplus distribution in West Africa. Each model was evaluated with the area under the receiver operating characteristic curve (AUC), the true skill statistic (TSS) and the Boyce index (BI). The selected models had good performance according to their AUC (above .8), TSS (above .7) and BI (above .8). Temperature played a key role in MaxEnt model, whereas normalised difference vegetation index (NDVI) was the most important variable in the ensemble model. The model predictions showed coastal countries of West Africa as more suitable for R. microplus. However, some Sahelian areas seems also favourable. We stress the importance of vector surveillance and control in countries that have not yet detected R. microplus but are in the areas predicted to host suitable habitat. Indeed, awareness-raising and training of different stakeholders must be reinforced for better prevention and control of this tick in these different countries according to their status.}},
  author       = {{Zannou, Olivier M. and Da Re, Daniele and Ouedraogo, Achille S. and Biguezoton, Abel S. and Abatih, Emmanuel and Yao, Kouassi Patrick and Farougou, Souaïbou and Lempereur, Laetitia and Vanwambeke, Sophie O. and Saegerman, Claude}},
  issn         = {{1865-1674}},
  journal      = {{TRANSBOUNDARY AND EMERGING DISEASES}},
  keywords     = {{General Veterinary,General Immunology and Microbiology,General Medicine,boosted regression tree,ensemble modelling,generalised additive model,generalised linear model,maximum entropy,random forest,Rhipicephalus microplus,support vector machine,West Africa,SPECIES DISTRIBUTION MODELS,BOOPHILUS-MICROPLUS,CATTLE TICK,GEOGRAPHIC-DISTRIBUTION,ACARI IXODIDAE,DISTRIBUTIONS,ACCURACY,RESOURCE,MAXENT,SPREAD}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{2938--2951}},
  title        = {{Modelling habitat suitability of the invasive tick Rhipicephalus microplus in West Africa}},
  url          = {{http://doi.org/10.1111/tbed.14449}},
  volume       = {{69}},
  year         = {{2022}},
}

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