Nipah Virus Outbreak in Kerala: UPSC Current Affairs

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Picture Courtesy: THEHINDU

Why In News?

Health officials in Kerala have issued an alert against Nipah infections in the State from April to September.

What is Nipah Virus (NiV)?

The Nipah Virus (NiV) is a highly pathogenic zoonotic virus (transmitted from animals to humans) that causes severe respiratory illness and fatal encephalitis (inflammation of the brain).

It is classified as a Biosafety Level 4 (BSL-4) pathogen due to its high fatality rate, which ranges from 40% to 75%. (Source: WHO)

Virology and Transmission

Genus: It belongs to the genus Henipavirus and the family Paramyxoviridae.

Natural Reservoir: The Pteropus bat (commonly known as the Fruit Bat or Flying Fox) is the natural host of the virus. The bats carry the virus without falling ill themselves.

Modes of Transmission

Animal-to-Human: Consuming fruits (like dates or fallen mangoes) contaminated with the saliva or urine of infected fruit bats.
Human-to-Human: Close contact with the secretions (blood, urine, saliva) of an infected person. This is common in hospital settings (nosocomial transmission).
Accidental Hosts: Pigs can act as intermediate hosts; the first-ever Nipah outbreak in Malaysia (1998) was linked to pig farming.

Clinical Features and Diagnosis

Incubation Period: 4 to 14 days, but can extend up to 45 days.

Symptoms: Initially presents as "flu-like" symptoms (fever, headache, cough). However, it rapidly progresses to acute encephalitis (drowsiness, disorientation, seizures, and coma).

Diagnosis: The RT-PCR test using throat/nasal swabs or cerebrospinal fluid. For later stages, the ELISA test is used to detect antibodies.

Treatment and Prevention

No Vaccine: Currently, there is no specific vaccine or drug approved for Nipah virus for either humans or animals.

Treatment: Primary care is limited to Supportive Care (managing symptoms and ensuring hydration).

Experimental Drugs: During the 2023-24 Kerala outbreaks, the Monoclonal Antibody (mGAP) was imported from Australia for "compassionate use" under ICMR supervision.

Why is Nipah a Recurring Issue in India (Kerala)?

Ecological Encroachment: Destruction of bat habitats forces bats closer to human settlements, increasing the "spillover" risk.

Climate Change: Changes in fruiting seasons of trees lead to bats foraging in areas heavily populated by humans.

High Population Density: In states like Kerala, the high density of population and rapid urban-rural connectivity facilitates quick human-to-human spread.

Governance and Public Health Response

One Health Approach: India is moving toward a "One Health" framework that integrates human, animal, and environmental health data to predict outbreaks.

Integrated Health Information Platform (IHIP): A digital platform used for real-time surveillance and reporting of infectious diseases, including Nipah.

WHO R&D Blueprint: Nipah is listed as a priority disease by the WHO, meaning it has the potential to cause a pandemic and requires urgent research.

Source: THEHINDU

Attempt Daily Quiz

PRACTICE QUESTION

Q. Consider the following statements regarding the Nipah virus (NiV):

1. It is a zoonotic paramyxovirus with Pteropus fruit bats as its natural reservoir.

2. There is a licensed human vaccine available in India for its prevention.

Which of the statements given above is/are correct?

a) 1 only

b) 2 only

c) Both 1 and 2

d) Neither 1 nor 2

Answer: a

Explanation:

Statement 1 is correct: The Nipah virus (NiV) is a highly pathogenic zoonotic virus belonging to the Paramyxoviridae family. The Pteropus fruit bats (commonly known as flying foxes) are its natural reservoir hosts.

Statement 2 is incorrect: As of early 2026, there is no licensed vaccine or specific antiviral treatment available for Nipah virus infection in humans or animals anywhere in the world. Treatment is limited to intensive supportive care.

Frequently Asked Questions (FAQs)

The Nipah virus is a highly fatal zoonotic paramyxovirus transmitted by fruit bats. It is considered a severe public health emergency due to its exceptionally high mortality rate (often exceeding 80% in India), the extreme vulnerability of children, and the absence of licensed human vaccines or targeted therapeutics.

Kerala's rapid urbanization and agricultural expansion into the Western Ghats have disturbed natural bat habitats, increasing the human-animal interface. Additionally, climate change and local ecological disruptions are causing bat roosts to shift, aligning outbreaks with bat breeding and fruiting seasons.

Approved in February 2024, the NOHM is an initiative steered by the Office of the Principal Scientific Adviser. It recognizes the interconnectedness of human, animal, and environmental health, aiming to build an integrated and proactive disease control system against zoonotic threats.