From the Evolutionary Ecology of Infectious Disease Group, Department of Zoology (F.B.P.), and the Weatherall Institute of Molecular Medicine, John Radcliffe Hospital (D.J.W.), University of Oxford, Oxford, United Kingdom.
Dan L. Longo, M.D., Editor
Address reprint requests to Dr. Piel at the Department of Zoology, University of Oxford, Tinbergen Bldg., South Parks Rd., Oxford OX1 3PS, United Kingdom, or at [email protected].
No potential conflict of interest relevant to this article was reported.
Disclosure forms provided by the authors are available with the full text of this article at NEJM.org.
