<prompt> Bull neck in Diphtheria is due to -Retropharyngeal abscessLaryngeal edemaCellulitisLymphadenopathy  <response>: Ans. is d i.e., Lymphadenopathy Clinical manifestations of diphtheria A Faucial tonsillo pharyngeal diphtheria o It is the commonest type of diphtherial infection. o Incubation period is 2-5 days. o Patients present with malaise, sore throat and moderate fever. o A thick adherent pseudomembrane gray or white is present on one or both tonsils or adjacent pharynx. o Dislodging the membrane is likely to cause bleeding. o A small percentage of patients present with massive swelling of the tonsils and uvula with cervical lymphadenopathy bull neck and severe toxemia -- Malignant diphtheria. Systemic toxicity toxemia is usually most severe when pseudomembrane extends from tonsil and pharynx faucial diphtheria to adjacent areas. B Laryngeal diphtheria o Presents as hoarseness and cough. o It is the most severe form of respiratory diphtheria. Trocheostomy may be required. C Nasal diphtheria o Presents with unilateral or bilateral nasal discharge. o Mildest form of respiratory diphtheria DCutaneous diphtheria Caused by nontoxigenic strains o Presents as distinct punched out ulcers. o More common in tropical areas. o Other less common type of diphtheria are con juctival, otitic, genital - vulval, vaginal or prepucial, gastrointestinal. 