Sustainable interventions key to successful schistosomiasis control

A decade after the conclusion of a schistosomiasis control program in Mali, prevalence of the disease had regressed to pre-intervention levels, according to a study published May 5 in the open-access journal PLoS Neglected Tropical Diseases.

The researchers, led by Dr Archie Clements at the University of Queensland, found that clusters of schistosomiasis infections occurred generally in the same, original areas ten years after the end of a donor-funded control program, conducted between 1982 and 1992.

Schistosomiasis is a parasitic disease caused by several species of fluke of the genus Schistosoma. Although it has a low mortality rate, schistosomiasis often is a chronic illness that can damage internal organs and, in children, impair growth and cognitive development.

Mali is one of the first countries in sub-Saharan Africa to have initiated a national schistosomiasis control program, which began as a partnership between the Malian Ministry of Health, the WHO, and the German Technical Cooperation (GTZ). Lack of government funding curtailed the program's activities after 1998, until a new program, backed by the Schistosomiasis Control Initiative, began in 2004.

Clements and his co-authors undertook a comparative study of the spatial distribution of schistosomiasis in Mali between 1984-1989 and 2004-2006. They show that the spatial distribution of schistosomiasis was similar in both time periods, even in the face of large-scale control program based on mass distribution of anti-parasitic drugs.

According to Clements, long-term stability in the spatial distribution of schistosomiasis means that reviewing historic data can provide a useful, initial source of evidence for planning targeted contemporary control program.

"However, if these control program are to have a sustainable impact on the burden of schistosomiasis they must be delivered over a very long time period, or supplementary methods need to be implemented, such as improvement in water sanitation and hygiene," he said.

Co-authors on this manuscript include: Elisa Bosqué-Oliva, Moussa Sacko, Aly Landouré, Robert Dembélé, Mamadou Traoré, Godefroy Coulibaly, Albis F. Gabrielli, Alan Fenwick, and Simon Brooker.

FINANCIAL DISCLOSURE: The Schistosomiasis Control Initiative was funded by the Bill and Melinda Gates foundation. Simon Brooker is supported by a Career Development Fellowship (081673) from the Wellcome Trust. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

COMPETING INTERESTS: The authors have declared that no competing interests exist.

PLEASE ADD THIS LINK TO THE PUBLISHED ARTICLE IN ONLINE VERSIONS OF YOUR REPORT: http://dx.plos.org/10.1371/journal.pntd.0000431 (link will go live upon embargo lift)

CITATION: Clements ACA, Bosque´-Oliva E, Sacko M, Landoure´ A, Dembe´le´ R, et al. (2009) A Comparative Study of the Spatial Distribution of Schistosomiasis in Mali in 1984-89 and 2004-06. PLoS Negl Trop Dis 3(5): e431. doi:10.1371/journal.pntd.0000431

CONTACT:

Vanessa Mannix Coppard
Communications
School of Population Health
Faculty of Health Sciences
The University of Queensland
T: 0424207771
v.mannixcoppard@sph.uq.edu.au

This press release refers to an upcoming article in PLoS Neglected Tropical Diseases. The release is provided by the article authors and their institutions. Any opinions expressed in these releases or articles are the personal views of the journal staff and/or article contributors, and do not necessarily represent the views or policies of PLoS. PLoS expressly disclaims any and all warranties and liability in connection with the information found in the releases and articles and your use of such information.

PLoS Neglected Tropical Diseases (http://www.plosntds.org/) is a peer-reviewed, open-access journal devoted to the pathology, epidemiology, prevention, treatment, and control of the neglected tropical diseases, as well as public policy relevant to this group of diseases. All works published in PLoS Neglected Tropical Diseases are open access, which means that everything is immediately and freely available subject only to the condition that the original authorship and source are properly attributed. The Public Library of Science uses the Creative Commons Attribution License, and copyright is retained by the authors.

The Public Library of Science (PLoS) is a non-profit organization of scientists and physicians committed to making the world's scientific and medical literature a freely available public resource. For more information, visit http://www.plos.org.