Look at: http://gpawww.who.ch/aidscase/dec1995/current.htm Dr Alan J. Cann PhD, Department of Microbiology & Immunology, University of Leicester, P.O. Box 138, Medical Sciences Building, University Road, Leicester LE1 9HN, UK. Email: nna at le.ac.uk http://www-micro.msb.le.ac.uk/AJC/nna.html