1. Corixa Corporation1and
2. Infectious Disease Research Institute,2 Seattle, Washington 98104;
3. Department of Microbiology, Colorado State University, Fort Collins, Colorado 805233;
4. SmithKline Beecham Biologicals, Rixensart, Belgium4;
5. Federal University of Bahia, Salvador, Brazil5; and
6. Department of Pathobiology, University of Washington, Seattle, Washington 981956