<prompt> A patient presents with headache, high fever and meningismus. Within 3 days he becomes unconscious. Most probable causative agent ?Naegleria fowleriAcanthamoeba castellaniEntamoeba histolyticaTrypanosoma cruzi  <response>: Ans. is a i.e., Naegleria fowleri Amongst the given options Naeglaria and Acanthamoeba cause amoebic encephalitis. The prognosis of Naeglaria encephalitis is uniformaly poor, most patients die within a week. Acanthamoeba encephalitis follows a more indolent course. 