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The number of PR records retrieved by malarious area by country. The scale expresses the number of PR surveys for every 1,000 km2 of area malarious. The latter is as determined by the spatial limits of malaria in each country [36, 37]. Mayotte, Sao Tome and Principe, Gambia, Vanuatu and Cape Verde were excluded for visualization purposes because their very small malarious areas biased these calculations. These countries ranked top in the order listed.
