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Science 2 March 2007:
Vol. 315. no. 5816, pp. 1227 - 1228
DOI: 10.1126/science.1139839
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Perspectives

EPIDEMIOLOGY:
Keep It Local

Angus Buckling

Studies of virus evolution within caterpillars and bacteria show that greater host mobility is associated with the emergence of more infective parasites.

The author is in the Department of Zoology, University of Oxford, Oxford OX1 3PS, UK. E-mail: angus.buckling{at}zoology.oxford.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)