1. Núcleo de Doenças Infecciosas, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, Brazil
2. Department of Medicine, Division of Infectious Diseases, Case Western Reserve University School of Medicine and University Hospitals Case Medical Center, Cleveland, Ohio
3. Departments of Pathology and Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas