<prompt> Corynebacterium diphtheriae causes -PseudomembranePunched out ulcerMyocarditisAll of the above  <response>: Ans. is d i.e., All of the above Clinically diphtheria is divided into1 Facial tonsillo-pharyngeal diphtheria It is the commonest type with incubation period of 2-5 days. There is thick adherent pseudomembrane grey or white on one or both tonsils or adjacent pharynx. Dislodging of membrane is likely to cause bleeding. A small perecentage of patient present with massive swelling of tonsils and uvula with cervical lymphadenopathy bull neck and severe toxemia, called malignant diphtheria.2 Laryngeal diphtheria It is the most severe form of diphtheria.3 Nasal diphtheria It is the mildest form.4 Cutaneous diphtheria It is caused by nontoxigenic strain and patient presents with punched out ulcer.5 Other forms These are conjunctival, otitic, genital vulval, vaginal or prepucial, and gastrointestinal. Complications of diphtheria are obstruction due to pseudomembrane, myocarditis, polyneuropathy, post- diphtheric paralysis and pneumonia. Post-diphtheric paralysis occurs in 3rd or 4th week and characterized by palatine and pupillary paralysis with complete recovery after sometime. There is isolated cranial nerve isolated ocular paralysis. Less common complications of diphtheria are renal failure, encephalitis, cerebral infarction, pulmonary embolism and bacteremia or endocarditis. 