J. S. Anderson, F. C. Happold, J. W. McLeod, and J. G. Thomson were the first to distinguish the gravis, mitis, and intermediate types of C. diphtheriae.
J. S. Anderson, F. C. Happold, J. W. McLeod, and J. G. Thomson were the first to distinguish the gravis, mitis, and intermediate types of C. diphtheriae.