POPULATION BIOLOGY. For the article “Persistent colonization and the spread of antibiotic resistance in nosocomial pathogens: Resistance is a regional problem,” by David L. Smith, Jonathan Dushoff, Eli N. Perencevich, Anthony D. Harris, and Simon A. Levin, which appeared in issue 10, March 9, 2004, of Proc. Natl. Acad. Sci. USA (101, 3709–3714; first published February 25, 2004; 10.1073/pnas.0400456101), the authors note that the equation in the ninth line under the subheading “LTCFs” on page 3714 incorrectly read
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It should read
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