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An epidemic model is studied to understand the effect of a population dispersal on the spread of a disease in two patches. Under the assumption that the dispersal of infectious individuals isbarred, it is found that susceptive dispersal may cause the spreadof the disease in one patch even though the disease dies out ineach isolated patch. For the case where the disease spreads in eachisolated patch, it is shown that suitable susceptive dispersalcan lead to the extinction of the disease in one patch.
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Wendi Wang (2004) studied this question.
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