Survey methodology.
TRACHOMA
Between 2014 and 2021, population-based trachoma impact surveys (TISs) and trachoma surveillance surveys (TSSs) were conducted in all districts of Amhara designed to assess the prevalence of TF among children ages 1–9 years. As described in previous reports, a multistage cluster randomized methodology was used to estimate the prevalence in each district.During the cluster selection process, approximately half of the selected clusters from each district were chosen randomly for the additional swab collection and then, within each cluster, the first 25 children ages 1–5 years encountered within selected households by survey teams were selected for swabbing.