In their study looking at vitamin B2 status in relation to Hb concentration, although no hookworm was detected, 9% of the girls had light ascariasis and 14% had light trichuriasis.22 Consistent with the earlier study, the authors suggest that subclinical inflammation is unlikely to have led to substantial confounding between vitamin B2 status and Hb concentration. The gene discussed is GSTM1; the disease is ascariasis.