1. Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.
2. Naval Medical Research Institute and Uniformed Services University of Health Sciences, Bethesda, MD 20814.
3. National Institute of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892.
4. Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3050, Australia.
5. Papua New Guinea Institute of Medical Research, Madang, Papua New Guinea.