Annual Flu Shot: Why It Matters for People with Asthma and Allergies

Hello! I am Dr. Balachandra B V,

“Doctor, my child has asthma. Does he really need a flu shot every year?”

This is a common question. For people with asthma, influenza can be more than just a few days of fever and cough. Flu can increase airway inflammation, trigger asthma attacks and increase the risk of complications such as pneumonia.

What Is the Annual Flu Shot?

Influenza viruses keep changing, so the composition of the seasonal flu vaccine is regularly updated. Seasonal vaccines are designed to protect against important circulating influenza viruses, including H1N1, H3N2 and influenza B in current trivalent formulations.

That is why flu vaccination is recommended every year, rather than as a one-time vaccine.

Why Is It Important in Asthma?

Asthma already makes the airways sensitive and inflamed. When influenza infects the respiratory tract, it can add further inflammation and potentially trigger:

• Wheezing and breathlessness

• Increased cough

• Asthma attacks

• Pneumonia

• Hospitalization in severe cases

The 2026 GINA strategy recommends annual influenza vaccination for people with moderate-to-severe asthma, following local immunization schedules.

What About Allergies?

Having an allergy itself does not mean you should avoid the flu vaccine. In fact, vaccination can be particularly important when allergic disease is accompanied by asthma or other chronic respiratory problems.

If you have previously had a serious reaction to an influenza vaccine or one of its components, discuss vaccination with your doctor before receiving another dose.

Does the Flu Vaccine Guarantee Protection?

No vaccine provides 100% protection. You may still get influenza after vaccination, but vaccination can reduce the risk of flu and help reduce the severity and complications of illness.

Frequently Asked Questions

Does H1N1 come under the flu vaccine?

Yes. Seasonal influenza vaccines are formulated to protect against selected circulating influenza strains, including an H1N1 component.

Can a child with asthma take the flu vaccine?

Influenza vaccination is generally recommended for children aged 6 months and older, including children with asthma, unless there is a contraindication.

Can the flu vaccine cause flu?

The injectable flu vaccine does not cause influenza infection.

Does my child need the flu vaccine every year?

Yes. Annual vaccination is recommended because influenza viruses change and vaccine formulations are updated.

If my child has asthma, should we wait until flu season starts?

Ideally, vaccination is given before the influenza season, but vaccination later in the season can still provide protection.

Final Thoughts

For someone with asthma, preventing influenza can be an important part of protecting the lungs.

The flu shot does not replace asthma controller medication or an asthma action plan. Instead, it adds another layer of protection against a respiratory infection that can trigger worsening asthma.

If you or your child has asthma, recurrent wheezing or significant respiratory allergies, speak with your doctor about the appropriate annual influenza vaccination and other recommended vaccines.

For pediatric allergy, asthma evaluation, vaccination guidance and respiratory care, consult Dr. Balachandra B V, Consultant Pediatrician & Allergy Specialist, Chirayu Multispeciality Clinic, Kasturi Nagar, Bangalore.