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The impact of climate change on the geographical distribution of two vectors of Chagas disease: implications for the force of infection.

ABSTRACT: Chagas disease, caused by the parasite Trypanosoma cruzi, is the most important vector-borne disease in Latin America. The vectors are insects belonging to the Triatominae (Hemiptera, Reduviidae), and are widely distributed in the Americas. Here, we assess the implications of climatic projections for 2050 on the geographical footprint of two of the main Chagas disease vectors: Rhodnius prolixus (tropical species) and Triatoma infestans (temperate species). We estimated the epidemiological implications of current to future transitions in the climatic niche in terms of changes in the force of infection (FOI) on the rural population of two countries: Venezuela (tropical) and Argentina (temperate). The climatic projections for 2050 showed heterogeneous impact on the climatic niches of both vector species, with a decreasing trend of suitability of areas that are currently at high-to-moderate transmission risk. Consequently, climatic projections affected differently the FOI for Chagas disease in Venezuela and Argentina. Despite the heterogeneous results, our main conclusions point out a decreasing trend in the number of new cases of Tr. cruzi human infections per year between current and future conditions using a climatic niche approach.

SUBMITTER: Medone P

PROVIDER: S-EPMC4342964 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature

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The impact of climate change on the geographical distribution of two vectors of Chagas disease: implications for the force of infection.

Medone Paula P Ceccarelli Soledad S Parham Paul E PE Figuera Andreína A Rabinovich Jorge E JE

Philosophical transactions of the Royal Society of London. Series B, Biological sciences 20150401 1665

Chagas disease, caused by the parasite Trypanosoma cruzi, is the most important vector-borne disease in Latin America. The vectors are insects belonging to the Triatominae (Hemiptera, Reduviidae), and are widely distributed in the Americas. Here, we assess the implications of climatic projections for 2050 on the geographical footprint of two of the main Chagas disease vectors: Rhodnius prolixus (tropical species) and Triatoma infestans (temperate species). We estimated the epidemiological implic ...[more]

PMID: 25688019

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Project description:IntroductionThe fungus Cordyceps cicadae is both edible and medicinal.MethodsTo acquire a thorough comprehension of its distribution in China, two host insects, Macrosemia pieli and Platypleura kaempferi, were selected as biological factors potentially associated with its distribution, the ENMTools program was utilized to ascertain the principal environmental factors affecting the distribution of potentially suitable habitats. The possible geographic distributions in the present as well as in the 2030s, 2050s, and 2070s were then predicted using the optimized MaxEnt model.ResultsThe primary environmental variables were soil pH, mean diurnal range, annual precipitation, precipitation seasonality, annual mean temperature and precipitation of the driest month. C. cicadae thrived on steep slopes. and some of which also significantly affect the distribution of its two hosts. Most of the suitable habitats of C. cicadae and M. pieli were currently found in the subtropical monsoon zone. The SSP126, SSP370, and SSP585 scenarios were associated with positive, stable, and unfavorable impacts on the extent of suitable habitats for C. cicadae, respectively, and the suitability of P. kaempferi decreased under three different conditions. The expansion of the C. cicadae was observed in provinces bordering the middle and lower reaches of the Yellow River, as well as in Zhanjiang, Guangdong Province, and northern Yunnan Province. Conversely, its habitat contraction was mainly found in western Guangdong, southern Guangxi, northern Hainan, southwestern Yunnan, and areas bordering eastern Sichuan. The shared contraction regions with its two hosts were primarily located in western Guangdong, southern Guangxi, and southern Sichuan. Moreover, the future centroids were found at higher elevations than the present ones in the provinces of Jiangxi and Hunan.DiscussionIn light of climate change, this research held significance for the conservation and sustainable utilization of C. cicadae.

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The impact of climate change on the geographical distribution of two vectors of Chagas disease: implications for the force of infection.

Publications

The impact of climate change on the geographical distribution of two vectors of Chagas disease: implications for the force of infection.

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