1. Information and Public Relations Dept, Government of Andhra Pradesh, Hyderbad, India
2. Department of Microbiology, Montana State University, Lewis Hall, Room 109, P.O. Box 173520, Bozeman, MT 59717, USA
3. Harvard School of Public Health, Bldg 1, Rm G17, 665 Huntington Avenue, Boston, MA 02115, USATel: 617 432 3434 Fax: 617 432 3349
4. Regional Center for Urban and Environmental Studies, Osmania University, Hyderabad, India