Prognosis

Nipah virus (NiV) infection may be asymptomatic but more often causes a severe disease. Case fatality rates vary by outbreak, but are estimated to range from 40% to 75%. The rate was approximately 30% to 40% in the Malaysian outbreak, approximately 70% in Bangladesh outbreaks, and approximately 90% in the Kerala, India outbreak.[22][23][37][10] Patients who survive may develop persistent fatigue, somnolence, and/or neurological impairment. They may also develop late-onset and/or relapsed encephalitis.[36]

As of May 2018, there have been a total of 7 cases of Hendra virus (HeV) infection in humans since its discovery in 1994, with 4 fatalities (case fatality rate of 57%).[13][36] 

HeV encephalitis may relapse, as is the case with NiV.[48]

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