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The World Health Organization currently recommends annual mass antibiotic treatment to eliminate the ocular chlamydia that cause blinding trachoma. Active trachoma is believed to be seasonal in many areas of the world, and the optimal season in which to treat has not as yet been established. Here we use mathematical models of disease transmission to demonstrate that ideally, treatment should be administered before the low season to have the greatest chance of locally eliminating infection.
Received October 18, 2004. Accepted for publication November 29, 2004.
Acknowledgments: We thank Stephanie Costanza at the Proctor Foundation for her invaluable help with this study.
Financial support: This work was supported by That Man May See, Research to Prevent Blindness, the National Institute of Allergy and Infectious Diseases (grant R21 AI55752-01), and the National Eye Institute (grant U10 EY16214-01).
Authors addresses: David C. Lee, F. I. Proctor Foundation, 95 Kirkham Street, University of California, San Francisco, San Francisco, CA 94143-0944, Telephone: 415-502-2662, Fax: 415-476-0527, E-mail: dleeatfas{at}gmail.com. Jaya D. Chidambaram, F. I. Proctor Foundation, 95 Kirkham Street, Room 306, University of California, San Francisco, San Francisco, CA 94143-0944, Telephone: 415-514-2163, Fax: 415-476-0527, E-mail: jaya{at}itsa.ucsf.edu. Travis C. Porco, Senior Epidemiologist, California Department of Health Services, Tuberculosis Control Branch Surveillance and Epidemiology Section, 2151 Berkeley Way, Room 608, Berkeley, CA 94704, Telephone: 510-540-3516, Fax: 510-540-2062, E-mail: TPorco{at}dhs.ca.gov. Thomas M. Lietman, World Health Organization Collaborating Center for the Prevention of Blindness, F. I. Proctor Foundation, 95 Kirkham Street, Room 307, University of California San Francisco, San Francisco, CA 94143-0944, Telephone: 415-502-2662, Fax: 415-476-0527, E-mail: tml{at}itsa.ucsf.edu.
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