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Definition of Nipah virus
Medically reviewed by Min Clinic Staff | Updated: January 2026
Nipah virus: A member of the paramyxovirus family isolated from samples from an outbreak of encephalitis and respiratory illness among adult men in Malaysia and Singapore in 1999 that causes a sometimes fatal form of viral encephalitis. The humans were infected by close contact with infected pigs. Symptoms include high fever and aches, coma, and sometimes death.