1Division of Bacterial Diseases, Respiratory and Special Pathogens Branch, Center for Infectious Diseases, Centers for Disease Control, Atlanta, GA, 30333, U.S.A.
2Division of Bacterial Diseases, Statistical Services Branch, Center for Infectious Diseases, Centers for Disease Control, Atlanta, GA, 30333, U.S.A.
3Division of Mycotic Diseases, Center for Infectious Diseases, Centers for Disease Control, Atlanta, GA, 30333, U.S.A.