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Science 21 June 2002:
Vol. 296. no. 5576, pp. 2158 - 2162
DOI: 10.1126/science.1063699
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Review

Climate Warming and Disease Risks for Terrestrial and Marine Biota

C. Drew Harvell,1* Charles E. Mitchell,12 Jessica R. Ward,1 Sonia Altizer,34 Andrew P. Dobson,5 Richard S. Ostfeld,6 Michael D. Samuel7

Infectious diseases can cause rapid population declines or species extinctions. Many pathogens of terrestrial and marine taxa are sensitive to temperature, rainfall, and humidity, creating synergisms that could affect biodiversity. Climate warming can increase pathogen development and survival rates, disease transmission, and host susceptibility. Although most host-parasite systems are predicted to experience more frequent or severe disease impacts with warming, a subset of pathogens might decline with warming, releasing hosts from disease. Recently, changes in El Niño-Southern Oscillation events have had a detectable influence on marine and terrestrial pathogens, including coral diseases, oyster pathogens, crop pathogens, Rift Valley fever, and human cholera. To improve our ability to predict epidemics in wild populations, it will be necessary to separate the independent and interactive effects of multiple climate drivers on disease impact.

1 Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA.
2 Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, MN 55108, USA.
3 Department of Environmental Studies, Emory University, Atlanta, GA 30322, USA.
4 Cornell Laboratory of Ornithology, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA.
5 Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA.
6 Institute of Ecosystem Studies, Box AB, 65 Sharon Turnpike, Millbrook, NY 12545, USA.
7 U.S. Geological Survey-National Wildlife Health Center, Madison, WI 53711, USA.
*   To whom correspondence should be addressed. E-mail: cdh5{at}cornell.edu

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