1. D. G. Colley is director of the Division of Parasitic Diseases, NCID/CDC, Atlanta, GA 30341, USA.
2. P. T. LoVerde is a professor of Microbiology at the School of Medicine and Biomedical Sciences, SUNY, Buffalo, NY 14214, USA.
3. L. Savioli is coordinator of Parasitic Diseases and Vector Control, Communicable Diseases Control, Prevention and Eradication, WHO, Geneva, Switzerland.