Microbiology Clinical diphtheria is caused by: (PGI June 2009) A Corynebacterium diphtheriae B Corynebacterium parvum C C. Ulcerans D Streptococcus pyogens π‘ Explanation Clinical diphtheria is caused by: (PGI June 2009) β Correct Answer: A. Corynebacterium diphtheriae