1. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;
2. Central Public Health Laboratory, London, United Kingdom; ‡The Rockefeller University, New York, New York, USA;
3. University of Minnesota, Minneapolis, Minnesota, USA;
4. National Institute of Public Health, Prague, Czech Republic,
5. National Center for Streptococcus, Edmonton, Alberta, Canada;
6. Communicable Disease Group, ESR, Porirua, New Zealand;
7. Institute of Experimental Medicine, St. Petersburg, Russia;
8. Yale University, New Haven, Connecticut, USA;
9. University of Alabama, Birmingham, Alabama, USA;
10. National Institutes of Health, Bethesda, Maryland, USA;
11. ##Emory University, Atlanta, Georgia, USA