Epidemiology Understanding

Overview

Data from spacecraft can provide medical as well as environmental intelligence: satellites are beginning to come to the aid of authorities working to prevent the spread of epidemics. The incidence of diseases such as malaria is influenced by local climate variation.

Satellite data has the potential to help forecast disease outbreaks. For example, increased rainfall and temperature levels lead to upsurges in malaria cases as mosquito numbers rise in response.

As part of a project called Epidemio, ESA is providing products to the World Health Organisation (WHO) leading a global partnership called Roll Back Malaria, aimed at halving malaria cases by 2010, distributing countermeasures such as bednets.

They include satellite-derived maps of water bodies as well as digital elevation models and weekly land surface temperature maps. Water mapping is especially useful for malaria risk mapping as mosquitoes begin life as aquatic larvae and adults rarely travel more than two kilometres from their breeding site in their two to three week lifetime.

This is very important in areas prone to malaria epidemics, where local environmental factors are key influences on the character of outbreaks. In the Sahel region of Africa, for instance, climate and temporary water bodies play a large role in determining the pattern of the malaria season.

In Niger, ESA assists the locally-based Centre de Recherche Médicale et Sanitaire (CERMES) in this area, who work in turn with the assistance of France’s University of Marne la Vallée. The objective is to better quantify the links between environment and malaria transmission by area.

Combining this data with climate forecasting makes it possible to determine areas of greatest risk of malaria epidemics and take action accordingly.

ESA is also assisting the Gabon-based International Centre for Medical Research (CIRMF) in their search for the unknown animal or plant carrier of the deadly Ebola haemorrhagic fever. Detailed vegetation maps of Congo and Gabon are being created with satellite images to help co-ordinate field surveys and look for patterns in the environmental characteristics associated with areas where infected animals are found.

In the African Sahel, satellites are tracking massive desert dust storms blowing across the region, in order help Niger-based medical researchers studying lethal meningitis epidemics that follow in the dust’s wake.

The lethal disease is common in the Sahel 'meningitis belt' and irritation to local inhabitants' mucus membranes by dust, coupled with seasonal dryness, may make them more vulnerable to infection from meningitis-causing bacteria.

Last update: 8 September 2006

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