<prompt> Clinical diphtheria is caused by: PGI June 2009Corynebacterium diphtheriaeCorynebacterium parvumC. UlceransStreptococcus pyogens  <response>: Ans: A Corynebacterium . diph-theriae Diphtheria is a nasopharyngeal skin infection caused by corynebacterium diphtheriaQ- H17th890C. Ulcerans H17th893-95 Cause exudative pharyngitis cutaneous diseaseQ Produce both diphtheria toxin dermonecrotic toxinC. ulcerans infection is considered a zoonosis person to person transmission has not been firmly establishedC. Pseudotuberctilosis Preisz Nocard bacillusQ or C. Hofmannii- H17th 894 A 7th240 Cause pseudotuberculosisin sheep suppurative lymphadenitis in horsesNot produce diphtheria toxinIt is part of normal flora of nasopharynxHuman infections- particularly endocarditis of either prosthetic valve or native valves invasive pneumonia- have been identified only rarelyCorynebacterium Parvum A7th240It is used as immunomodulatorStrptococcus Pyogens A7th204Causes upper respiratory tract infection, pyoderma, rheumatic fever glomerulonephritis 