1. Centers for Disease Control and Prevention, Atlanta, Georgia, USANew York City Department of Health and Mental Hygiene, New York, New York, USA
2. New York City Department of Health and Mental Hygiene, New York, New York, USA
3. Montefiore Medical Center, Department of Infectious Diseases, Bronx, New York, USA
4. World Health Organization Collaborating Center for Reference and Research on Streptococci, Minneapolis, Minnesota, USA