GSTM1 and malaria: This study, therefore, evaluated the impact on malaria incidence of community-level screening (using RDT) and treatment of asymptomatic carriers of P. falciparum on the number of microscopy-confirmed cases of symptomatic malaria with a parasite density >5,000/μL seen over a 12-month period, compared with no screening with RDT nor treatment of asymptomatic carriers, as well as the direct benefit from treatment on haemoglobin (Hb) levels in asymptomatic carriers who received AL.