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Multiple species of bacteria may cause trachoma: Implications for treatment
Date:1/2/2008

In a study published in this weeks PLoS Medicine, researchers have found that more than one species of bacteria may be causing the infectious eye disease trachoma. Six million people most of whom live in crowded and unhygienic conditions in the developing world are blind because of the disease and many more are actively infected. The possibility that multiple strains of the Chlamydiceae family of bacteria are involved in trachoma would involve a re-evaluation of vaccines and treatment programmes.

It is accepted that Chlamydia trachomatis (C. trachomatis) causes trachoma. The bacteria, some strains of which are associated with sexually transmitted infections, can also pass between people on hands and clothing; successive infections cause scarring of the inside of the eyelid. As the eyelashes of the infected eyes turn inward they scar the cornea - the transparent tissue covering the front of the eye - leading eventually to blindness. To investigate whether other species of Chlamydiceae also cause human trachoma, Deborah Dean and colleagues from Childrens Hospital Oakland Research Institute and the University of California San Francisco conducted their research in the Lumbini Zone of south-western Nepal where the disease is endemic. Obtaining specimens from 146 individuals in 9 households, they found that a third of the people who had trachoma were infected with only C. trachomatis, including not only the type that is typically described in trachoma-infected eyes but also the type usually associated with sexually transmitted diseases. Also, participants with Chlamidiacae infections of the eye were infected only with species previously associated with lung infections: one in five showed Chlamydophilia psittaci (C. psittaci) and one in ten Chlamydophila pneumoniae (C. pneumoniae); infection with these strains was just as strongly linked with severe inflammation of the eyes as was infection with the C. trachomatis bacteria already known to cause tr
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Contact: Andrew Hyde
press@plos.org
44-122-346-3330
Public Library of Science
Source:Eurekalert

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