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Rachel V Thomas

H1N1 Virus Surge In Delhi : Should You Get A Flu Vaccine Now?|Explained

Delhi-NCR is witnessing a sharp increase in seasonal influenza, with 1,777 confirmed H1N1 (swine flu) cases reported out of 2,392 total <span>Influenza A</span> cases.

According to data from the National Centre for Disease Control (NCDC), the corresponding period last year recorded just 229 H1N1 cases.

Several hospitals in the national capital have reported a significant increase in cases. However, so far there have been no reports of patients requiring ICU care or ventilator support.

“Delhi is fully prepared to deal with the present health situation. There is no shortage of beds, doctors, medicines or essential medical equipment, and every patient will receive timely and appropriate treatment,” health authorities said.

<h2>Is The H1N1 Surge Due To A New Strain?</h2>

The Indian Council of Medical Research (ICMR) has confirmed that the current surge is not due to a new strain of H1N1 and has advised people to follow precautions rather than panic, PTI reported.

According to the apex research body, the Influenza A (H1N1) viruses currently circulating in India belong to the A/Missouri/11/2025 (H1N1)pdm09-like virus strain.

“These viruses belong to clade 6B.1A.5a2a, subclade D.3.1.1, and have been in circulation since 2025,” the ICMR said. “Seasonal influenza, including H1N1, is mostly self-limiting,” it added.

<h2>Is The Current H1N1 Strain Covered By The <span rel="noindex">Flu Vaccine</span>?</h2>

The ICMR said the influenza strains currently circulating in India are well matched with the vaccine strains recommended for the Northern Hemisphere.

For both egg-based vaccines and cell culture-, recombinant protein- or nucleic acid-based vaccines, the World Health Organization (WHO) recommends an A/Missouri/11/2025 (H1N1)pdm09-like virus.

<strong><em>HealthandMe </em></strong>spoke to experts to understand whether people should consider getting a flu vaccine amid the current rise in H1N1 cases and who should prioritise vaccination.

Doctors stressed that annual influenza vaccination remains an important tool to reduce the risk of severe illness, complications and hospitalization, particularly among people at higher risk.

“Since the 2009 H1N1 pandemic, H1N1 is no longer given as a separate standalone vaccine. The H1N1 strain is included in the regular seasonal influenza vaccine, whether trivalent or quadrivalent. Therefore, getting the recommended annual flu vaccine also protects against H1N1,” Dr Tushar Tayal, Associate Director, Internal Medicine, CK Birla Hospital, Gurugram, told <strong><em>HealthandMe</em></strong>.

<h2>Who Should Prioritize Flu Vaccination?</h2>

The seasonal influenza vaccine is recommended every year for everyone aged six months and above. Doctors say vaccination is particularly important for:

<ul><li>Pregnant women</li><li>Older adults</li><li>Young children</li><li>Healthcare workers</li><li>People with diabetes</li><li>People with asthma</li><li>People with heart disease</li></ul>

The Indian Medical Association (IMA) advises that the inactivated influenza vaccine can be given to the above high-risk groups. 

“The live attenuated influenza vaccine (intranasal spray) can be given only to persons aged 2-49 years (not to pregnant females),” as per the IMA.

“The H1N1 flu vaccine is typically administered annually before flu season, around October, as a single intramuscular dose at clinics, pharmacies or hospitals,” Dr Atul Gogia, Head, Infectious Diseases, Sir Ganga Ram Hospital, New Delhi, told <strong><em>HealthandMe</em></strong>.

For most adults and children aged over nine years, one dose each year is sufficient. However, children aged six months to eight years who are receiving the flu vaccine for the first time may require two doses at least four weeks apart. After the initial vaccination, one annual dose is generally sufficient.

<h2>Should You Get The Flu Vaccine Now?</h2>

In India, influenza vaccination is ideally taken ahead of periods when flu activity tends to increase, particularly during the monsoon and winter months. The vaccine is available through hospitals, clinics and vaccination centers.

With H1N1 cases currently rising in Delhi-NCR, people who fall into high-risk groups may particularly benefit from discussing vaccination with their doctor.

<h2>Can The Flu Vaccine Prevent H1N1 Completely?</h2>

“While the shot drastically reduces hospitalizations and complications, its primary limitation is that it does not offer 100% protection against infection, nor does it cover non-influenza viruses. However, even if contracted, vaccination significantly softens the disease’s severity,” Dr Atul said.

Dr Tayal also explained that vaccine effectiveness can vary from season to season, depending on how well the vaccine strains match the influenza viruses circulating at the time.

<h2>Why Is Annual Flu Vaccination Needed?</h2>

According to Dr Tayal, annual vaccination can reduce the risk of severe influenza, complications, hospitalization and flu-related deaths. However, it does not provide complete protection against every respiratory infection.

The flu vaccine protects against influenza viruses, including H1N1, but does not prevent illnesses caused by other viruses or bacteria.

Along with annual vaccination, experts advised people to:<ul><li>Maintain good hand hygiene</li><li>Follow respiratory etiquette, including covering the mouth and nose when coughing or sneezing</li><li>Stay home when unwell</li><li>Avoid close contact with others when experiencing flu-like symptoms</li></ul>

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Delhi-NCR is witnessing a sharp increase in seasonal influenza, with 1,777 confirmed H1N1 (swine flu) cases reported out of 2,392 total Influenza A cases.According to data from the National Centre for Disease Control (NCDC), the corresponding period last year recorded just 229 H1N1 cases.Several hospitals in the national capital have reported a significant increase in cases. However, so far there have been no reports of patients requiring ICU care or ventilator support.“Delhi is fully prepared to deal with the present health situation. There is no shortage of beds, doctors, medicines or essential medical equipment, and every patient will receive timely and appropriate treatment,” health authorities said.Is The H1N1 Surge Due To A New Strain?The Indian Council of Medical Research (ICMR) has confirmed that the current surge is not due to a new strain of H1N1 and has advised people to follow precautions rather than panic, PTI reported.According to the apex research body, the Influenza A (H1N1) viruses currently circulating in India belong to the A/Missouri/11/2025 (H1N1)pdm09-like virus strain.“These viruses belong to clade 6B.1A.5a2a, subclade D.3.1.1, and have been in circulation since 2025,” the ICMR said. “Seasonal influenza, including H1N1, is mostly self-limiting,” it added.Is The Current H1N1 Strain Covered By The Flu Vaccine?The ICMR said the influenza strains currently circulating in India are well matched with the vaccine strains recommended for the Northern Hemisphere.For both egg-based vaccines and cell culture-, recombinant protein- or nucleic acid-based vaccines, the World Health Organization (WHO) recommends an A/Missouri/11/2025 (H1N1)pdm09-like virus.HealthandMe spoke to experts to understand whether people should consider getting a flu vaccine amid the current rise in H1N1 cases and who should prioritise vaccination.Doctors stressed that annual influenza vaccination remains an important tool to reduce the risk of severe illness, complications and hospitalization, particularly among people at higher risk.“Since the 2009 H1N1 pandemic, H1N1 is no longer given as a separate standalone vaccine. The H1N1 strain is included in the regular seasonal influenza vaccine, whether trivalent or quadrivalent. Therefore, getting the recommended annual flu vaccine also protects against H1N1,” Dr Tushar Tayal, Associate Director, Internal Medicine, CK Birla Hospital, Gurugram, told HealthandMe.Who Should Prioritize Flu Vaccination?The seasonal influenza vaccine is recommended every year for everyone aged six months and above. Doctors say vaccination is particularly important for:Pregnant womenOlder adultsYoung childrenHealthcare workersPeople with diabetesPeople with asthmaPeople with heart diseaseThe Indian Medical Association (IMA) advises that the inactivated influenza vaccine can be given to the above high-risk groups. “The live attenuated influenza vaccine (intranasal spray) can be given only to persons aged 2-49 years (not to pregnant females),” as per the IMA.“The H1N1 flu vaccine is typically administered annually before flu season, around October, as a single intramuscular dose at clinics, pharmacies or hospitals,” Dr Atul Gogia, Head, Infectious Diseases, Sir Ganga Ram Hospital, New Delhi, told HealthandMe.For most adults and children aged over nine years, one dose each year is sufficient. However, children aged six months to eight years who are receiving the flu vaccine for the first time may require two doses at least four weeks apart. After the initial vaccination, one annual dose is generally sufficient.Should You Get The Flu Vaccine Now?In India, influenza vaccination is ideally taken ahead of periods when flu activity tends to increase, particularly during the monsoon and winter months. The vaccine is available through hospitals, clinics and vaccination centers.With H1N1 cases currently rising in Delhi-NCR, people who fall into high-risk groups may particularly benefit from discussing vaccination with their doctor.Can The Flu Vaccine Prevent H1N1 Completely?“While the shot drastically reduces hospitalizations and complications, its primary limitation is that it does not offer 100% protection against infection, nor does it cover non-influenza viruses. However, even if contracted, vaccination significantly softens the disease’s severity,” Dr Atul said.Dr Tayal also explained that vaccine effectiveness can vary from season to season, depending on how well the vaccine strains match the influenza viruses circulating at the time.Why Is Annual Flu Vaccination Needed?According to Dr Tayal, annual vaccination can reduce the risk of severe influenza, complications, hospitalization and flu-related deaths. However, it does not provide complete protection against every respiratory infection.The flu vaccine protects against influenza viruses, including H1N1, but does not prevent illnesses caused by other viruses or bacteria.Along with annual vaccination, experts advised people to:Maintain good hand hygieneFollow respiratory etiquette, including covering the mouth and nose when coughing or sneezingStay home when unwellAvoid close contact with others when experiencing flu-like symptoms

h1n1 virus surge in delhi : should you get a flu vaccine now?|explained

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