Key Takeaways
- In India, an estimated 1.27 lakh influenza-associated deaths occur annually, with about 65% in adults aged 60+ and 15-20% in children under 5 (ICMR study).
- Flu vaccination cuts hospitalization risk by 79% in people with diabetes and reduces major cardiac events by over one-third in those with heart disease (Immunization Managers, 2025).
- Globally, flu vaccination reduces infection-associated mortality by roughly 50% overall, and in high-risk groups it can bring death risk close to baseline levels (Gavi analysis).
- Pregnant women who get vaccinated cut their baby’s flu risk by about 50% in the first 6 months of life, when infants are too young to be vaccinated themselves (CDC).
- In the 2024-2025 season alone, the US flu vaccine prevented an estimated 2.4 lakh hospitalizations and 1.2 crore illnesses (CDC burden estimates).
Every year, influenza circles the globe, and every year, thousands of people in India die from it. Not because the flu itself is unbeatable, but because too many at-risk patients never get the one shot that could save them. The disconnect is simple: many people think of the flu as a bad cold. It is not. For a 68-year-old with diabetes, a 4-year-old with asthma, or a pregnant woman in her third trimester, seasonal influenza can trigger pneumonia, heart attacks, respiratory failure, or death. The flu vaccine is not a suggestion. For high-risk populations, it is a lifeline.
Why Influenza Is Deadly for High-Risk Groups
Influenza is not a uniform illness. In a healthy young adult, it usually means fever, body aches, and a week in bed. But in people with pre-existing conditions, the immune system is already stretched. The flu virus amplifies inflammation, destabilizes blood sugar, stresses the heart, and opens the door for bacterial pneumonia.
Data from India paints a stark picture. A study published in the Indian Journal of Medical Research using the Sample Registration System estimated that seasonal influenza causes roughly 1,27,000 deaths annually in India, with 65% of these in adults aged 60 and above and 15-20% in children under five (ICMR analysis, 2023). Globally, the 2024-2025 US flu season saw 47-82 million illnesses and 27,000-1,30,000 deaths (CDC FluView).
Ninety percent of adults hospitalized with flu in recent seasons had at least one underlying chronic condition (American Lung Association). The flu does not kill randomly. It kills the vulnerable. Vaccination targets that vulnerability head-on.
Who Falls in the High-Risk Category?
High-risk groups are defined by age, physiology, and pre-existing disease. The CDC and WHO include the following in their high-risk categories:
- Adults aged 60 years and above — age weakens immune response, making even routine flu strains dangerous.
- Children under 5 years, especially infants and toddlers with developing immune systems.
- Pregnant women — pregnancy alters heart and lung function, increasing flu severity.
- People with chronic lung disease — asthma, COPD, and post-TB lung damage make flu complications far more likely.
- People with heart disease — flu triggers inflammation that can provoke heart attacks and worsen heart failure.
- People with diabetes — flu destabilizes blood sugar and increases infection risk.
- People with kidney disease, liver disease, or weakened immune systems — from cancer treatment, HIV, or long-term steroid use.
- People with obesity (BMI over 40) — linked to impaired immune response to flu.
- Residents of long-term care facilities — close quarters plus frailty multiply risk.
If you or a family member falls into any of these categories, a flu shot is not optional. It is preventive medicine at its most effective.
The Numbers: How Flu Shots Save Lives in Each High-Risk Group
People with Diabetes
A study published in the Clinical Infectious Diseases journal found that flu vaccination reduces the risk of flu-related hospitalization by 79% in people with diabetes (Communicating Benefits of Influenza Vaccination, 2025). India is home to over 10 crore people with diabetes, the second-highest number of any country. A simple annual shot could prevent lakhs of hospitalizations in this group alone.
People with Heart Disease
Flu vaccination reduces the risk of a major cardiac event — such as a heart attack or stroke — by more than one-third (National Forum, 2025-2026 Flu Fact Sheet). In patients with acute coronary syndrome, the reduction in cardiac death can reach 50%. For a cardiologist or a pulmonologist, this is an astonishing return from a single injection.
People with Chronic Lung Disease (Asthma, COPD)
Patients with chronic lung disease are among the most vulnerable. Vaccination reduces flu-related hospitalization by 52% in people with chronic lung disease (Immunization Managers, 2025). For asthma patients specifically, studies show a 55% reduction in lab-confirmed flu risk. If you have COPD, a flu shot is one of the cheapest and most effective ways to stay out of the hospital. Dr. Nalini Nagalla offers expert pulmonary medicine consultations for patients with asthma and COPD who want to optimize their respiratory health before flu season hits.
Older Adults (60+)
Adults aged 65 and above account for the majority of flu deaths worldwide. In India, older adults carry 65% of the influenza-attributable mortality burden. But vaccination changes the equation. Studies show flu vaccination cuts hospitalizations in older adults by 30-40%, and high-dose or adjuvanted vaccines (recommended specifically for this age group) provide even stronger protection (Massachusetts 2025-2026 Clinical Advisory). Enhanced vaccines for seniors are up to 25% more effective than standard-dose shots.
Children
Flu vaccination cuts pediatric flu deaths by half in children with high-risk medical conditions and by two-thirds in otherwise healthy children (Immunization Managers, 2025). The 2024-2025 season recorded 289 pediatric flu deaths in the US — the highest for any non-pandemic season on record. Most of these deaths were preventable.
Pregnant Women and Newborns
Vaccination during pregnancy halves flu-associated acute respiratory infections in the mother and reduces flu-related hospitalization by 40%. Even more critically, infants under 6 months — too young for the vaccine themselves — get about 50% protection if their mother was vaccinated during pregnancy (CDC). That is two for one — mother and child protected by one shot.
Flu and Your Lungs: Why a Pulmonologist Matters
Influenza is primarily a respiratory infection. It attacks the airways, inflames the lungs, and in vulnerable patients, it triggers pneumonia, acute respiratory distress syndrome (ARDS), and worsening of chronic lung conditions. If you already have asthma or COPD, the flu can spiral into a medical emergency within days.
That is why pulmonologists recommend annual flu vaccination as a cornerstone of lung health management. Alongside vaccination, managing underlying respiratory conditions through expert care reduces your overall risk. Dr. Nalini Nagalla provides comprehensive pulmonary care in Hyderabad, covering asthma, COPD, chronic cough, and post-Covid respiratory issues. For patients with sleep disorders who are also at higher flu risk, her sleep medicine services offer integrated care for better overall health.
Common Myths About the Flu Shot
Despite decades of evidence, myths keep people away from the vaccine. Here is the truth behind the most common ones.
“The flu shot gives you the flu.”
This is false. Injected flu vaccines contain inactivated (dead) virus particles. They cannot cause infection. Some people feel mild soreness or low-grade fever for a day — that is the immune system responding, not the flu.
“I never get sick. I don’t need it.”
Even if you are healthy, you can carry and spread the flu to vulnerable family members — elderly parents, young children, pregnant relatives. Vaccination is as much about protecting others as yourself.
“I had the shot last year, so I am covered.”
Flu viruses mutate rapidly. Every year, the vaccine is updated to match circulating strains. Last year’s shot does not protect against this year’s virus. Annual vaccination is necessary.
“The vaccine is only 40-50% effective. Why bother?”
In high-risk groups, even 40% reduction in hospitalization translates into millions of prevented severe outcomes. When your baseline risk is high, moderate protection saves lives. A 40% effective vaccine in an older adult with heart disease is far better than zero protection.
When and Where to Get the Flu Shot in Hyderabad
Flu season in India typically peaks during the monsoon months (June-September) and again in winter (November-February). The ideal time to get vaccinated is before the season starts — April to June for the monsoon wave, and October for the winter wave. Protection takes about two weeks to develop after the shot.
If you or a family member belongs to a high-risk group, talk to your doctor about getting the flu shot early this season. For patients with chronic respiratory conditions, integrating flu vaccination with your regular pulmonary check-up is a smart strategy. Book a consultation with Dr. Nalini Nagalla at her Gachibowli clinic to discuss your flu prevention plan alongside your lung and sleep health needs.
Take Action This Flu Season
The evidence is clear. Annual flu vaccination cuts hospitalizations, prevents cardiac events, protects pregnant women and newborns, and saves lives across every high-risk group. With India recording over 20,000 lab-confirmed flu cases and hundreds of deaths in 2024 alone, the risk is not theoretical. It is here, and it is seasonal.
Do not wait until flu hits your home. Talk to a pulmonologist. Get your shot. Protect yourself and everyone around you.
Dr. Nalini Nagalla, MD, FSM, is a pulmonologist and international sleep specialist with 24+ years of experience, practicing in Hyderabad, India.
