1. Division of Parasitic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Public Health Service, U.S. Department of Health and Human Services, Atlanta, Georgia1;
2. División de Microbiologı́a y Parasitologı́a y Centro de Bioingenierı́a, Universidad Miguel Hernández, Alicante, Spain2;
3. Department of Tropical Parasitology, Institute of Maritime and Tropical Medicine, Gdynia, Poland3; and
4. Department of Environmental Health Sciences, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, Maryland4