Microbiology All India exam 4fd2a5ef Wrong about Corynebacterium diphtheriae A Toxin production is chromosome mediated B Damage is by toxin production C Toxic to hea and neurons D More common in children High-Yield Explanation C. diphtheriae virulence is mediated by its toxin which is produces by tox gene of DNA of Corynephage (bacteriophage).