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. 2012 Mar 27;11:89. doi: 10.1186/1475-2875-11-89

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Copyright ©2012 Doudou et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Relative difference in incidence (rΔinc) with respect to Gaya (the southernmost site) as a function of latitude, during the rainy season when malaria transmission rates were high. RΔinc is defined by the following equation: rΔinc = SPR Gaya (1-SPR site x)/SPR site x (1-SPR Gaya), where SPR Gaya is the slide-positive rate at Gaya and SPR site x is the slide-positive rate at the other site, x. As Gaya was the site with the highest SPR, all rΔinc values are, by definition, < 1. RΔinc indicates the ratio of the incidence at a given site with respect to that at Gaya, with value of 1 indicating no difference and a value of 0.1 indicating a malaria incidence one tenth that at Gaya.