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.

Cartograms of the PAR of malaria from P. falciparum and P. vivax in 2005.
(a) P. falciparum risk. (b) P. vivax risk. In these cartograms, the area is distorted in proportion to the national population at risk (PAR) of malaria, defined as the number of people inhabiting malarious regions in that nation. These maps are useful global indicators and represent broad spatial patterns, but it should be noted that the risk of developing disease, disability or death from malaria infection is specific to parasite and region.