1. Department of Microbiology and Immunology The Pennsylvania State University College of Medicine Hershey PA
2. Merck Research Labs Exploratory Sciences Center Cambridge MA
3. Victorian Infectious Diseases Reference Laboratory Royal Melbourne Hospital, at the Peter Doherty Institute for Infection and Immunity Melbourne Australia
4. Department of Biomedicine University Hospital BaselUniversity of Basel Basel Switzerland
5. Department of Microbiology and Immunology Georgetown University Medical Center Washington DC