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Climate and cholera: An increasingly important link

ANN ARBOR---The link between climate and cholera, a serious health problem in many parts of the world, has become stronger in recent decades, say researchers from the University of Michigan, the University of Barcelona and the International Center for Diarrhoeal Disease Research in Bangladesh.

Their research will be published in the online version of the Proceedings of the National Academy of Sciences this week.

In a previous study published in the journal Science, the researchers found evidence that El Nino-Southern Oscillation (ENSO), a major source of climate variability from year to year, influences cycles of cholera. In that work, they looked only at climate and disease data from Bangladesh for the past two decades. In the new research, they compared those results with data from Bangladesh for the periods 1893-1920 and 1920-1940 to see whether the coupling between climate variability and cholera cycles has become stronger in recent decades. Their examination of the data, which relied on a suite of techniques called time series analysis, suggests that it has.

"What is new in this work is not showing that ENSO plays a role in the variability of cholera, but that the role of ENSO has intensified," says Mercedes Pascual, an assistant professor in the department of Ecology and Evolutionary Biology at the University of Michigan. In addition, the link is strongest following ENSO events, with cholera increasing after warm events and decreasing after cold events. In the years between events, the climate-cholera connection breaks down.

Scientists who study climate change predict that ENSO will become stronger and more variable in coming years under a global warming scenario, so understanding how its connection to human disease changes will be increasingly important, says Pascual.

Cholera, an intestinal infection with symptoms that may include diarrhea, vomiting and leg cramps, is caused by the bacterium Vibrio cholerae. People us
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Contact: Nancy Ross-Flanigan
rossflan@umich.edu
734-647-1853
University of Michigan
27-Aug-2002


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