Streptococcal Disease Laboratory, Francis E. Warren Air Force Base, Wyoming
Department of Preventive Medicine, Western Reserve University, Cleveland, O.
2 Present address: Western Reserve University School of Medicine, Cleveland 6, O.
3 Present address: Barnes and Wohl Hospitals, St. Louis 10, Mo.
4 Present address: Hospital of the Rockefeller Institute, New York 21, N. Y.
1 This investigation was conducted under the sponsorship of the Commission on Acute Respiratory Diseases and the Commission on Streptococcal Diseases, Armed Forces Epidemiological Board, and was supported by the Offices of The Surgeons General, Departments of the Army and Air Force, Washington, D. C.