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It is well accepted that infectious diseases are a driving force in the coevolution of parasites and their hosts. In a Perspective, Brown discusses an elegant study that examines the coevolution of virulence in rust fungus and resistance to this parasite in the wild flax plant (Thrall and Burdon).
The author is in the Department of Disease and Stress Biology, John Innes Centre, Norwich, NR4 7UH, UK. E-mail: james.brown{at}bbsrc.ac.uk
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