1. R.M.M. is at Centre for Immunity, Infection and Evolution, and Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, Scotland, UK
2. E.J.P. is at Trudeau Institute, Saranac Lake, NY 12983
3. D.A. is at Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104
4. M.Y. is at Department of Parasitology, Leiden University Medical Center, Leiden, Netherlands
5. T.A.W. is at Immunopathogenesis Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892