Description

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Picture Courtesy: THEHINDU

Why In News?

India is witnessing a resurgence of Bird Flu with confirmed outbreaks in Chhattisgarh (Bilaspur), Kerala (Alappuzha), Tamil Nadu (Chennai), and Maharashtra (Nagpur).

What is Bird Flu?

Avian Influenza, commonly known as Bird Flu, is a viral infection caused by Influenza Type A viruses that naturally occur in wild aquatic birds (ducks, geese) but can infect domestic poultry and other animals.

Origin: First detected in China (1996), it has since evolved into multiple clades (currently Clade 2.3.4.4b is dominant globally).

India’s History: India reported its first major outbreak in 2006 (Navapur, Maharashtra). Since then, the country has seen recurring seasonal outbreaks.

Strains: Influenza Type A viruses are classified based on two proteins on their surface: Hemagglutinin (H) and Neuraminidase (N).

H5N1: Highly pathogenic, high mortality in birds, potential to infect humans.
H9N2: Low pathogenic, but causes massive egg production drops.

The "Mammalian Spillover" Phenomenon

H5N1 is no longer just a "bird" flu; it is increasingly becoming a "multi-species" threat.

Marine & Terrestrial Impact: Widespread mortality has been recorded in sea lions, dolphins, foxes, pumas, and bears.
Endangered Species: The virus has caused devastating losses in wild bird populations, including the California condor, threatening biodiversity.
Recent Concern (2024-26): The infection of dairy cattle and goats in various parts of the world suggests the virus is acquiring mutations to replicate in mammalian respiratory tracts.

Transmission

Primary Route: Human infection is rare and occurs through direct contact with infected poultry (live or dead) or contaminated environments like live bird markets.
The Pandemic Risk: While human-to-human transmission is currently extremely rare, the virus is under constant genomic surveillance. A mutation allowing sustained human-to-human spread could trigger a global pandemic.

Symptoms & Severity

The clinical presentation of H5N1 in humans is more severe than seasonal flu.

Common Symptoms: High fever, cough, sore throat, and muscle aches.
Severe Complications: Rapid progression to pneumonia, Acute Respiratory Distress Syndrome (ARDS), and multi-organ failure.
Neurological Impact: Some cases report encephalitis or seizures, reflecting the virus's neurotropic potential.

Treatment

Antiviral Therapy: Oseltamivir is the frontline treatment. It is most effective when administered within 48 hours of symptom onset.
Supportive Care: Severe cases require supplemental oxygen and mechanical ventilation.

Source: THEHINDU

Attempt Daily Quiz

PRACTICE QUESTION

Q. "The recurring outbreaks of Avian Influenza in India expose the vulnerabilities of the livestock sector to zoonotic diseases. Discuss. 150 words

Frequently Asked Questions (FAQs)

The 'One Health' approach is a collaborative, multisectoral framework that recognizes the deep interconnection between human health, animal health, and environmental ecosystems. It emphasizes that solving public health threats like pandemics requires addressing all three domains simultaneously.

The H5N1 virus has a historically high case fatality rate (around 50-52%) in humans. Recent outbreaks (2024-2026) show the virus rapidly crossing the species barrier to infect mammals. If it mutates to transmit efficiently from human to human, it could trigger a catastrophic global pandemic.

DIVA stands for "Differentiating Infected from Vaccinated Animals." It is an advanced vaccine technology that protects poultry from the virus while allowing diagnostic tests to distinguish between a vaccinated bird and an actively infected one. This allows for disease surveillance and international trade to continue safely.