WHO世界卫生组织：2025年沙眼监测的诊断目标产品概况报告（英文版）

The need for interventions against active trachoma has traditionally been determined using the prevalence of clinical signs that are associated with conjunctival Chlamydia trachomatis infection. However, as trachoma prevalence declines, the specificity of these signs for C. trachomatis infection declines; in some places, specificity is low at baseline. In addition, as trachoma becomes more uncommon, training graders to recognize the signs becomes progressively more difficult. The target produ