Fig. 1

Evolution of PfRh2b deletion in Thiès (a) and Western Gambia (b). Scheme showing the variation in the prevalence of PfRh2b deletion over the time, including mixed infections (PfRh2 full-length and PfRh2b deletion) in both areas using formula described previously by Ahouidi et al. [10]. Alleles frequencies of the dimorphic PfRh2b gene were determined using semi-nested Polymerase Chain Reaction (PCR). a A decrease of PfRh2b deletion from 2007 to 2013 in Thiès was noted. b A fluctuation of this deletion from 1984 to 2013 in The Gambia was observed. N, number of isolates; Del, deletion