Abstract
In this paper, the author proposes some new ideas for the E-spread information systems for an epidemic E, and takes covering approximation spaces as mathematical models of E-spread information systems. By characterizations for connectivity of covering approximation spaces, the author solves the problem: How can one know that an epidemic E spreads easily or not easily in a E-spread information system? Furthermore, the author gives an example to demonstrate the usefulness, which gives a further application of rough set theory in medical sciences of the above result by logical methods and mathematical methods.
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