Modelling the ecological niche of hookworm in Brazil based on climate

Mudenda, Ntombi B. and Malone, John B. and Kearney, Michael T. and Mischler, Paula D. and Nieto, Prixia del Mar and McCarroll, Jennifer C. and Vounatsou, Penelope (2012) Modelling the ecological niche of hookworm in Brazil based on climate. Geospatial health, 6 (3). S111-S123. ISSN 1970-7096

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Abstract

The distribution of hookworm in schistosomiasis-endemic areas in Brazil was mapped based on climate suitability. Known biological requirements of hookworm were fitted to data in a monthly long-term normal climate grid (18 x 18 km) using geographical information systems. Hookworm risk models were produced using the growing degree day (GDD) water budget (WB) concept. A moisture-adjusted model (MA-GDD) was developed based on accumulation of monthly temperatures above a base temperature of 15 °C (below which there is no lifecycle progression of Necator americanus) conditional on concurrent monthly values (rain/potential, evapotranspiration) of over 0.4. A second model, designated the gradient index, was calculated based on the monthly accumulation of the product of GDD and monthly WB values (GDD x WB). Both parameters had a significant positive correlation to hookworm prevalence. In the northeastern part of Brazil (the Caatinga), low hookworm prevalence was due to low soil moisture content, while the low prevalence in southern Brazil was related to low mean monthly temperatures. Both environmental temperature and soil moisture content were found to be important parameters for predicting the prevalence of N. americanus.

Item Type:	Article
Uncontrolled Keywords:	Hookworm, Necator americanus, risk models, growing degree days, water budget, geographical information systems, Brazil.
Subjects:	600 Tecnologia - Scienze applicate > 610 Medicina e salute (Classificare qui la tecnologia dei servizi medici) > 616 Malattie (classificare qui la Clinica medica, la medicina basata sull'evidenza, la Medicina interna, la Medicina sperimentale) > 616.9 Altre malattie (altri rami della Medicina) > 616.96 Parassitosi, malattie causate da funghi (micosi) (classificare qui la Parassitologia medica) > 616.963 Malattie causate da trematodi (infezioni da trematodi) (include la schistosomiasi)
Depositing User:	Luca Tiberi
Date Deposited:	12 Sep 2019 09:51
Last Modified:	12 Sep 2019 09:51
URI:	http://eprints.bice.rm.cnr.it/id/eprint/6708

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