TPI1 and infection: A total of 13 (17% of all samples with infectious status identified using tpi locus; 11% of positive infections using diagnostic 18S real-time PCR) samples were identified as mixed G. duodenalis assemblage A and B infections (Samama school, N = 5; Mchoka school, N = 3; Sungusya school, N = 4 and Malinde [St.