What is influenza (the flu)?

Influenza, commonly known as the flu, is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to hospitalization or even death.

How does the flu spread?

The flu spreads mainly through droplets made when people with the flu cough, sneeze, or talk. These droplets can land in the mouths or noses of people who are nearby. Less often, a person might get the flu by touching a surface or object that has the flu virus on it and then touching their own mouth, nose, or eyes.

What are the symptoms of the flu?

Common symptoms include fever, cough, sore throat, runny or stuffy nose, body aches, headache, chills, and fatigue. Some people may also have vomiting and diarrhoea, though this is more common in children than adults.

How can the flu be prevented?

The best way to prevent the flu is by getting vaccinated each year. Other preventive measures include washing your hands often, avoiding close contact with sick people, and covering your mouth and nose with a tissue or your elbow when you cough or sneeze.

Can I get the flu from the vaccine?

No, the flu vaccine contains an inactivated virus or proteins that cannot cause infection. It helps your immune system recognize and fight the virus effectively.

How can I protect myself from the flu?

The best way to prevent the flu is to get vaccinated annually. Additionally. practice good hygiene: wash hands frequently, avoid close contact with sick individuals, and maintain a healthy lifestyle.

How often should I get the flu shot?

You should get the flu vaccine every year since flu viruses constantly evolve, and the vaccine is updated annually to protect against new strains.

Is the flu vaccine safe?

Yes, the flu vaccine is extensively tested and recommended by global health organizations like WHO and CDC. Most people experience only mild side effects, if any.

What are the common side effects?

Common side effects include soreness, redness, and swelling at the injection site, as well as low-grade fever, headache, and muscle aches. These side effects are usually mild and go away on their own.

Who needs the flu shot the most?

While everyone above 6 months should get vaccinated, it’s especially crucial for young children, elderly individuals, pregnant women, and those with chronic illnesses.

Can healthy adults skip the flu vaccine?

No, even healthy adults can get the flu and spread it to vulnerable individuals. The vaccine reduces your chances of getting sick and helps protect your community.

Who should NOT take the flu vaccine?

People with severe allergies to any flu shot ingredients or those who had a serious reaction to a previous dose should consult a doctor before getting vaccinated.

Can I take the flu shot if I have a cold?

If you have mild cold symptoms, you can still get vaccinated. However, if you have a fever or feel very unwell, it’s best to wait until you recover.

Can we take other brand flu vaccines?

Yes, you can get the other brand FLU vaccine. WHO’s plays an important role in maintaining uniformity in Influenza Vaccine Strains with all the manufacturers. So, all the flu vaccines contain same strains, you have to choose the latest influenza vaccine available in the marketplace.

Is Flu Vaccine Necessary in Monsoon? Benefits, Timing & Who Should Take It

The rain is here, and so is the flu. Every year, as the first showers hit Indian streets, hospitals start seeing a familiar spike in patients with fever, body aches, sore throats, and exhaustion. The monsoon feels refreshing, but for your immune system, it is one of the most challenging times of the year. This is exactly why a flu vaccine in monsoon season has become one of the most important health decisions you can make for yourself and your family.

But is it really necessary? Or is the flu just a bad cold that you can sleep off in a few days? Let's break it down.

Why Monsoon Is Prime Time for the Flu

India has a unique flu pattern compared to most of the world. While countries in the West experience one flu season, usually winter, India sees two flu peaks: one during the monsoon and another in the cooler winter months.¹

The monsoon brings conditions that are almost tailor-made for the influenza virus to thrive: higher humidity, cooler temperatures, crowded indoor spaces, and weaker immunity in many people due to dietary changes and reduced sun exposure. Add to this the fact that waterborne illnesses also surge during this season, and your body is fighting on multiple fronts at once.

This is not a small problem. According to the World Health Organization, WHO, seasonal influenza causes an estimated 290,000 to 650,000 respiratory deaths globally every year.² In developing countries like India, children under five are especially vulnerable, with 99% of flu-related deaths in this age group occurring in low- and middle-income nations.²

Getting a flu vaccine in monsoon or just before it starts is your simplest, most effective line of defense.

What Exactly Is the Flu Vaccine?

The influenza, or flu, vaccine is an annual injection designed to protect you against the most common and dangerous strains of the influenza virus circulating that year. Because flu viruses mutate constantly, the vaccine is updated every year to match the strains most likely to be dominant in the coming season.³

As per WHO recommendations, safe and effective flu vaccines have been in use for more than 60 years.² A single annual flu shot is enough to protect most healthy adults. Children under nine who are receiving it for the first time may need two doses, given four weeks apart.⁴

Key Flu Vaccine Benefits India Should Know About

Still wondering if it's worth the trouble? Here are the core flu vaccine benefits India's population can count on:

1. Reduces Your Risk of Getting Infected

The vaccine trains your immune system to recognize and fight the flu virus before it takes hold. This significantly lowers the probability of falling sick during the high-risk monsoon season.

2. Minimizes Severity If You Do Get Infected

Even if you contract the flu despite being vaccinated, the illness is likely to be milder and shorter. The vaccine prevents symptoms from seriously disrupting your daily life and helps you recover faster.⁵

3. Keeps You Out of the Hospital

For high-risk groups — seniors, pregnant women, young children, and people with chronic conditions — the flu can turn life-threatening. Flu shots significantly reduce the risk of flu-related hospitalizations in these groups.⁵

4. Protects the People Around You

When you get vaccinated, you are less likely to spread the virus to others. This is called herd immunity. The more people who are vaccinated, the less the virus can circulate, which helps protect those who cannot be vaccinated for medical reasons.

5. Reduces Complications Like Pneumonia

The flu can trigger severe secondary infections. Getting vaccinated lowers the chances of complications such as pneumonia, bronchitis, and ear or sinus infections.⁴

These flu vaccine benefits are not hypothetical; they are backed by decades of global health data and are especially relevant for a tropical country like India, where the flu never fully disappears.

When Should You Get the Flu Vaccine?

Timing matters. The flu vaccine takes about two weeks to build full immunity in your body. So ideally, you want to be vaccinated before the monsoon hits, not after you are already coughing.

The Indian Association of Preventive and Social Medicine, IAPSM, recommends starting vaccination campaigns in April to June for regions that experience a monsoon-related flu peak.⁶ This pre-monsoon window gives your body enough time to build protection before the virus starts circulating widely.

Here is a simple timing guide:

Best time: April to June, before monsoon
Still beneficial: July to September, during monsoon, better late than never
Also recommended: September to October, before winter flu season

If you missed the pre-monsoon window, do not skip the shot altogether. Getting vaccinated during the monsoon still offers meaningful protection. The flu is active throughout the season, and even partial-season protection is better than none.

Who Should Definitely Get the Flu Vaccine?

While the flu vaccine is recommended for everyone above six months of age, certain groups are at higher risk and should not skip it under any circumstances:

Elderly adults, 60+: As we age, the immune system weakens, making seniors more vulnerable to severe flu and its complications.⁵
Children under five: Young children, especially those under two, are at high risk of flu-related complications.⁴
Pregnant women: Pregnancy alters immunity, making the flu more dangerous for both mother and baby.⁵
People with chronic conditions: Those living with diabetes, asthma, heart disease, kidney disease, or other long-term illnesses face a higher risk of flu-related complications.⁵
Healthcare workers: Frontline workers are constantly exposed to the virus and can easily transmit it to vulnerable patients.
Frequent travellers: Airports and public transport during monsoon are hotbeds for viral transmission.

For older adults, doctors may recommend a high-dose flu vaccine or an adjuvanted vaccine, specifically designed to produce a stronger immune response in ageing immune systems.⁵

A Small Step With Big Payoffs

The flu vaccine does not require a hospital visit, significant recovery time, or major lifestyle adjustments. It is a quick, well-tolerated shot that can keep you healthy, productive, and present throughout the monsoon months.

In a country like India, vaccinations are still underutilized due to myths and lack of awareness; choosing to get vaccinated is both a personal health decision and a public health responsibility.

Talk to your doctor about getting the flu shot before the rain arrives this year. It is one of the simplest things you can do for yourself and for everyone around you.

References

PubMed Central. Seasonality of Influenza and Optimizing Timing of Vaccination: Systematic Review and Meta-Analysis. https://pmc.ncbi.nlm.nih.gov/articles/PMC12575404/
World Health Organization. Influenza Seasonal Fact Sheet. https://www.who.int/news-room/fact-sheets/detail/influenza-(seasonal)
INVC. Flu Vaccination in India. https://invc.co.in/flu-vaccination/india
Mehta Hospitals. Flu Vaccine for Kids: What Parents Need to Know. https://mehtahospital.com/pediatrics/flu-vaccine-for-kids/
Samarth Community Care. Why Should Older Adults Consider the Influenza Vaccine? https://care.samarth.community/influenza-vaccination-older-adults/
IAPSM Position Paper, Indian Journal of Community Medicine / PubMed. https://pmc.ncbi.nlm.nih.gov/articles/PMC11927814/