The following figure and caption are adapted from:

Guerra CA, RW Snow, and SI Hay
Mapping the global extent of malaria in 2005
Trends in Parasitology, 22:353-359
Copyright (2006), adapted with permission from Elsevier.

Global distribution of P. falciparum and P. vivax in 2005.
(a) Distribution of P. falciparum. (b) Distribution of P. vivax. Several sources of information on malaria risk (notably ITHGs [International Travel Health Guidelines] on malaria chemoprophylaxis, altitude limits for dominant vectors, climate limits for malaria transmission and human population density thresholds) have been combined in a geographic information system to generate these maps. See the step-by-step guide in Guerra et. al (2006) for a full description of the methods used to derive these limits.