<prompt> 5 year old child with pseudomembrane in throat, fever, sore throat, organism is ?Comma shaped gram negative bacilliClub shaped gram positive bacilliSpore forming gram positive bacilliFilamentous gram positive bacilli  <response>: Ans. is b i.e., Club shaped gram positive bacilli Corney bacterium diphtheria Non motile, non-capsulated, club shaped gram positive bacillus. Infect nasopharynx release exotoxin which cause local inflamation of epithelial surface, formation of membrane pseudomembrane and toxemia. 