IL13 and infection: Analysis of Schistosoma haematobium infection in Mali revealed that in chromosomal region 5q31-q33, polymorphisms in the IL13 gene promoter at −1055 and −591 were associated with the infection rate: alleles −1055C and −591A were preferentially transmitted to children with the 10% highest infection rate, whereas −1055T associated with the lowest infection levels [94].