<prompt> Bull neck in Diphtheria is due toRetropharyngeal abscessLaryngeal edemaCellulitisLymphadenopathy  <response>: Clinical manifestations of diphtheria A Faucial tonsillo pharyngeal diphtheriaIt is the commonest type of diphtherial infection.The incubation period is 2-5 days.Patients present with malaise, sore throat and moderate fever.A thick adherent pseudo membrane grey or white is present on one or both tonsils or adjacent pharynx.Dislodging the membrane is likely to cause bleeding.A small percentage of patients present with massive swelling of the tonsils and uvula with cervical lymphadenopathy bull neck and severe toxaemia malignant diphtheria.Systemic toxicity toxaemia is usually most severe when pseudo membrane extends from tonsil and pharynx faucial diphtheria to adjacent areas.B Laryngeal diphtheriaPresents as hoarseness and cough.It is the most severe form of respiratory diphtheria.Trocheostomy may be required.C Nasal diphtheriaPresents with unilateral or bilateral nasal discharge.The mildest form of respiratory diphtheriaDCutaneous diphtheriaCaused by nontoxigenic strainsPresents as distinct punched out ulcers.More common in tropical areas.Other less common types of diphtheria are conjunctiva, otitis, genital - vulval, vaginal or preputial, gastrointestinal. 