<prompt> 5 year old child with pseudomembrane in throat, fever, sore throat, the organism causing isComma shaped gram negative bacilliClub shaped gram positive bacilliSpore forming gram positive bacilliFilamentous gram positive bacilli  <response>: Corynebacterium diphtheriaNon-motile, non-capsulated, club-shaped gram-positive bacillusInfect nasopharynx release exotoxin which cause local inflammation of epithelial surface, the formation of a membrane pseudomembrane and toxemia.Refer: Nelsons Textbook of Pediatrics, SAE, 1st edition, pg no. 1345 - 1348 