Nipah virus (NiV) is a zoonotic virus belonging to the family Paramyxoviridae, genus Henipavirus. It was first identified in 1999 during an outbreak of disease that affected pig farmers in Malaysia and Singapore. The virus is named after Sungai Nipah, a village in Malaysia where the first human cases were detected.

Fruit bats of the Pteropodidae family are the natural reservoir hosts of Nipah virus. The virus can cause severe disease in both animals and humans, leading to encephalitis (inflammation of the brain) and respiratory illness with high mortality rates.

The World Health Organization (WHO) has identified Nipah virus as a priority pathogen for research and development due to its epidemic potential and the lack of adequate countermeasures.

Nipah virus (NiV) infection can cause a range of clinical presentations, from asymptomatic (subclinical) infection to acute respiratory syndrome and fatal encephalitis.

Initial Symptoms (3-14 days after exposure)

• Fever and headache
• Muscle pain (myalgia)
• Vomiting
• Sore throat

Severe Symptoms

• Dizziness and drowsiness
• Altered consciousness
• Neurological signs (encephalitis)
• Atypical pneumonia
• Respiratory distress
• Seizures
• Coma (within 24-48 hours in severe cases)

Some survivors experience long-term neurological effects including personality changes and persistent convulsions.

Nipah virus (NiV) can be transmitted to humans through multiple routes:

Direct Transmission from Animals

• Contact with infected bats or their bodily fluids
• Contact with infected pigs (primary route in Malaysia outbreak)
• Consuming fruits or fruit products contaminated by infected bats

Human-to-Human Transmission

Human-to-human transmission has been documented, particularly among family members and healthcare workers caring for infected patients. This makes NiV especially concerning from a public health perspective.

Date Palm Sap Contamination

In Bangladesh, consuming raw date palm sap contaminated by infected bats has been identified as a significant transmission route. Bats frequently visit date palm sap collection pots and can contaminate the sap.

Since there is no vaccine or specific treatment for NiV, prevention focuses on avoiding exposure and implementing public health measures:

For the General Public

• Avoid contact with sick pigs and bats in endemic areas
• Do not consume raw date palm sap in endemic regions
• Wash fruits thoroughly before consumption
• Avoid fruits with signs of bat bites
• Practice good hand hygiene

For Healthcare Workers

• Use appropriate personal protective equipment (PPE)
• Implement standard infection control precautions
• Isolate infected patients
• Practice safe handling of laboratory samples