1. Departments of Pathology1 and
2. Department of Medicine, Division of Infectious Diseases, Universidade Federal de Sao Paulo, Sao Paulo, Brazil2
3. Biology,3 University of Iowa, Iowa City, Iowa;
4. Department of Oral Medicine and Pathology, School of Dental Science, and Dublin Dental Hospital, Trinity College, University of Dublin, Dublin 2, Republic of Ireland4; and