<prompt> All are complication of diphtheria, Except:MyocarditisOcular muscle palsyCerebellar ataxiaHepatic failure  <response>: Ans. is d Hepatic failure Ref.: Harrison, 17e p 892 16e, p 834 15e, p 911; Nelson, 16e, p 818-819.It is confirmed that hepatic failure does not occur in diphtheria, but there is confusion regarding cerebellar ataxia. Cerebellar ataxia is not mentioned anywhere.CNS complications of diphtheria infection are encephalitis and cerebral infarction.I am not sure if ataxia can occur due to this. Moreover diphtheria infection is not mentioned in the list of infections causing ataxia.Other complications of diphtheria infection:Myocarditis and cardiomyopathyToxic neuropathy which includesBulbar neuritis can cause palatal and pharyngeal paralysisCranial neuropathy leads to oculomotor and ciliary paralysis Peripheral neuropathy - It is symmetrical causes proximal muscle weakness and spreads distally.PneumoniaPulmonary embolismBacteremia or endocarditisRenal failure 