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School-based surveillance for trachoma, while biased, offers a logistically simpler alternative to population-based sampling. Both methods provided similar insights into ocular chlamydia burden in this Ethiopian study.

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Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Public Health

Background:

  • Trachoma surveillance traditionally uses expensive random sampling of endemic districts.
  • Alternative school-based surveillance, common for other neglected tropical diseases, is logistically simpler.
  • Comparing population-based and school-based trachoma prevalence estimates is crucial for efficient public health strategies.

Purpose of the Study:

  • To compare the prevalence of trachomatous inflammation-follicular (TF) using population-based sampling versus school-based sampling in Ethiopian communities.
  • To assess the utility of school-based TF prevalence data in estimating community-level ocular chlamydia burden.

Main Methods:

  • Conducted a population-based survey of TF prevalence in 70 Ethiopian communities among children aged 1-9 years.
  • Calculated school-based TF prevalence estimates by examining children in grades 1-3 in all primary schools within each community.
  • Utilized receiver operating characteristic (ROC) curve analysis to compare the diagnostic performance of both sampling methods for detecting high ocular chlamydia prevalence.

Main Results:

  • Population-based TF prevalence was 39.1% (children aged 1-9), while school-based prevalence was 18.8% (grades 1-3).
  • School-based TF prevalence explained 35% of the variation in community-based prevalences (P < 0.001).
  • ROC analysis showed similar performance for both methods (AUC 0.73 vs. 0.71, P = 0.76) in identifying communities with >5% ocular chlamydia.

Conclusions:

  • School-based surveillance, despite inherent bias, provides comparable information to population-based methods for assessing ocular chlamydia burden in hyperendemic trachoma settings.
  • School-based monitoring may be a viable, logistically efficient alternative for trachoma surveillance in similar contexts.
  • Further research is needed to determine the generalizability of these findings to areas with lower trachoma prevalence.