a Department of Control of Neglected Tropical Diseases, World Health Organization, 20 avenue Appia, 1211 Geneva 27, Switzerland. b Retired, Lomé, Togo. c Department of Parasitic Diseases, National Institute of Communicable Diseases, Delhi, India. d Retired, Crozet, France. e Retired, Mangalore, India. f National Institute of Communicable Diseases, Rajahmundry, India. g Epidemiology and Social M...