Flow of facilities through assessment of eligibility, selection and randomization. † Strata 1 and 3 had fewer malaria cases in Kilimanjaro and Tanga, respectively, while strata 2 and 4 had more malaria cases when dividing the districts into two equal categories based on the proportion of malaria consultations. Equal numbers of facilities were randomized to each arm within strata. ‡ Control represents the standard RDT training arm. HW represents the health worker intervention arm. HWP represents the health worker and patient-oriented intervention arm.