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Published in: Malaria Journal 1/2011

Open Access 01-12-2011 | Research

A new world malaria map: Plasmodium falciparum endemicity in 2010

Authors: Peter W Gething, Anand P Patil, David L Smith, Carlos A Guerra, Iqbal RF Elyazar, Geoffrey L Johnston, Andrew J Tatem, Simon I Hay

Published in: Malaria Journal | Issue 1/2011

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Abstract

Background

Transmission intensity affects almost all aspects of malaria epidemiology and the impact of malaria on human populations. Maps of transmission intensity are necessary to identify populations at different levels of risk and to evaluate objectively options for disease control. To remain relevant operationally, such maps must be updated frequently. Following the first global effort to map Plasmodium falciparum malaria endemicity in 2007, this paper describes the generation of a new world map for the year 2010. This analysis is extended to provide the first global estimates of two other metrics of transmission intensity for P. falciparum that underpin contemporary questions in malaria control: the entomological inoculation rate (Pf EIR) and the basic reproductive number (PfR).

Methods

Annual parasite incidence data for 13,449 administrative units in 43 endemic countries were sourced to define the spatial limits of P. falciparum transmission in 2010 and 22,212 P. falciparum parasite rate (Pf PR) surveys were used in a model-based geostatistical (MBG) prediction to create a continuous contemporary surface of malaria endemicity within these limits. A suite of transmission models were developed that link Pf PR to Pf EIR and PfR and these were fitted to field data. These models were combined with the Pf PR map to create new global predictions of Pf EIR and PfR. All output maps included measured uncertainty.

Results

An estimated 1.13 and 1.44 billion people worldwide were at risk of unstable and stable P. falciparum malaria, respectively. The majority of the endemic world was predicted with a median Pf EIR of less than one and a median PfRc of less than two. Values of either metric exceeding 10 were almost exclusive to Africa. The uncertainty described in both Pf EIR and PfR was substantial in regions of intense transmission.

Conclusions

The year 2010 has a particular significance as an evaluation milestone for malaria global health policy. The maps presented here contribute to a rational basis for control and elimination decisions and can serve as a baseline assessment as the global health community looks ahead to the next series of milestones targeted at 2015.
Appendix
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Metadata
Title
A new world malaria map: Plasmodium falciparum endemicity in 2010
Authors
Peter W Gething
Anand P Patil
David L Smith
Carlos A Guerra
Iqbal RF Elyazar
Geoffrey L Johnston
Andrew J Tatem
Simon I Hay
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2011
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/1475-2875-10-378

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