Author Contributions: Drs Atik and Dean had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Dean.
Acquisition of data: Atik, Thanh, Luong, Lagree, Dean.
Analysis and interpretation of data: Atik, Dean.
Drafting of the manuscript: Atik, Lagree, Dean.
Critical revision of the manuscript for important intellectual content: Atik, Thanh, Luong, Dean.
Statistical analysis: Atik, Dean.
Obtained funding: Thanh, Dean.
Administrative, technical, or material support: Luong, Lagree, Dean.
Study supervision: Lagree, Dean.
Financial Disclosures: None reported.
Funding/Support: This work was supported by International Trachoma Initiative grant ITI 01-040 (Dr Dean) and Public Health Service grant EY/AI12219 (Dr Dean), from the National Institutes of Health.
Role of the Sponsor: The funding agencies/sponsors listed above had no involvement in the design and conduct of study; in the collection, management, analysis, or interpretation of the data; or in the preparation, review, or approval of the manuscript.
Previous Presentation: Presented in part at the Ninth Meeting of the WHO Alliance for the Global Elimination of Blinding Trachoma; Geneva, Switzerland; March 21-23, 2005.
Acknowledgment: We thank the individuals of Thanh Hoa Province in Vietnam, without whom this research would not have been possible.