"India's Influenza Surge Exposes Gaps in Pandemic Preparedness Systems"
Antigenic drift
gradual, minor mutations in influenza surface proteins accumulating over time.
Antigenic shift
sudden major genetic reassortment producing a novel influenza subtype with pandemic potential.
India's institutional framework for infectious disease surveillance rests on two central bodies. The Indian Council of Medical Research (ICMR), established in 1911, is the apex biomedical research body responsible for virological and genomic surveillance. It identifies circulating strains and advises on vaccine composition. The National Centre for Disease Control (NCDC) coordinates outbreak response and tracks case counts and geographic spread across states. Together, they operate a network of 73 Virus Research and Diagnostic Laboratories (VRDLs) that enable real-time strain characterisation.
Seasonal influenza surveillance in India uses a sentinel system. A fixed number of samples from patients with influenza-like illness (ILI) and Severe Acute Respiratory Infections (SARI) are tested throughout the year. This system was significantly strengthened after the COVID-19 pandemic, which exposed critical gaps in India's early-warning capacity. The current circulating strain has been confirmed as A/Missouri/11/2025 (H1N1) pdm09-like, placed in clade 6B.1A.5a2a, subclade D.3.1.1. Genetic changes reflect normal antigenic drift, gradual, minor mutations, and do not indicate a new or dangerous strain.
The three pillars of managing any outbreak are surveillance, prevention, and control. Surveillance means detecting an outbreak early and initiating appropriate action. For influenza, this includes genomic surveillance to identify the strain responsible and gauge its virulence. Prevention involves targeted advisories to high-risk groups, the elderly, pregnant women, and those with comorbidities, and vaccination of both high-risk individuals and health workers. Control means ensuring infected individuals receive timely treatment, including access to beds, laboratory testing, and antivirals, which are most effective within two days of symptom onset.
A critical weakness in India's current system is the absence of formally defined alert thresholds. The influenza positivity rate among SARI-admitted patients reached 16 per cent this year, up from 12 per cent last year. …
H1N1 virus is sometimes mentioned in the news with reference to which one of the following diseases?
COVID-19 pandemic accelerated class inequalities and poverty in India. Comment.
Consider the following statements regarding influenza virus evolution:
1.Antigenic drift refers to sudden, major reassortment of genetic material between human and animal influenza viruses.
2.Antigenic shift can produce a novel influenza subtype with pandemic potential.
3.The current H1N1 strain circulating in India shows evidence of antigenic shift.
How many of the statements given above are correct?
With reference to influenza management in India, consider the following statements:
1.Antivirals for influenza are most effective when administered within two days of symptom onset.
2.Influenza vaccine coverage among high-risk groups in India is estimated to be below 5 per cent.
3.India currently has formally defined alert thresholds that automatically trigger an escalated public health response when influenza positivity rates cross a set level.
Which of the statements given above is/are correct?
Consider the following statements regarding India's influenza surveillance system:
1.The Indian Council of Medical Research (ICMR) coordinates the outbreak response, while the National Centre for Disease Control (NCDC) conducts laboratory surveillance.
2.India's sentinel surveillance network includes 73 Virus Research and Diagnostic Laboratories (VRDLs).
3.Sentinel surveillance for influenza tests a fixed number of samples from patients with influenza-like illness (ILI) and Severe Acute Respiratory Infections (SARI) throughout the year.
How many of the statements given above are correct?
Match the following institutions with their primary role in India's influenza outbreak management:
List I (Institution) — List II (Primary Role)
A.ICMR — 1. Coordinates outbreak response and tracks geographic spread
B.NCDC — 2. Conducts virological and genomic surveillance
C.State Health Systems — 3. Implements the ground-level response
Select the correct match using the codes given below:
Which of the following best describes the concept of 'sentinel surveillance' as used in India's influenza monitoring system?
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