A sudden rise in H1N1 cases has put swine flu back in the spotlight in Delhi. As of August 20 (2026), the city had reported 1,777 H1N1 cases, making it the predominant influenza subtype among reported Influenza A infections. Infected people may experience fever, chills, sneezing, and cough, leaving many people worried that the virus has become more dangerous.
The good news is that the current virus strain is not new and can be managed. According to the Indian Council of Medical Research (ICMR), the Influenza strains are “well matched with the vaccine strains recommended for the Northern Hemisphere.” This means that existing vaccination and medication can offer protection against it.
However, the virus can still lead to health complications. Here is more about H1N1 virus and what people should know to prevent and manage it.
What is H1N1 Swine Flu
H1N1 is a type of influenza-A virus which first emerged globally in 2009, leading to a swine flu pandemic, 2009. All these years it has not disappeared completely and keeps circulating as one of the “seasonal influenza” viruses, infecting people.
Due to the seasonal changes recently, the H1N1 virus cases have been increasing, bringing new cases to the OPD. Check out the detailed symptoms in the following section.
What are the Symptoms of H1N1?
H1N1 infection can feel like an ordinary flu and the symptoms may differ from person to person, such as:
- Fever
- Cough
- Sore throat
- Runny or blocked nose
- Headache
- Eye pain and watery eyes
- Body aches
- Tiredness
- Loss of appetite
- Chills
- Nausea
- Vomiting
- Diarrhoea
But getting these symptoms does not mean you have H1N1 swine flu. Consulting a doctor is advised for testing and further evaluation of symptoms
Causes and Spread of H1N1 Swine Flu
H1N1 usually enters the body through the respiratory system when a person inhales tiny droplets carrying the virus.
It can also enter when these droplets come into contact with:
- Eyes
- Nose
- Mouth
The risk is higher during close contact, particularly in crowded or poorly ventilated places.
Once the virus reaches the respiratory tract, it attaches to the cells lining the nose, throat and airways. It then enters these cells, makes new copies of itself and spreads to nearby cells.
Once you get the virus, the symptoms may take until a day to show up. As per the NCBI report, children may spread the virus for up to 15 days of the infection, while people with weakened immunity may remain infectious for weeks or months. So, proper precautions are needed to prevent this spread.
However, H1N1 virus can not spread through the following ways:
- By eating pork.
- Through mosquito or insect bites.
- Touching a contaminated surface does not make you sick. The virus can infect you only if you touch your nose, eyes or mouth with unwashed hands and it enters your upper respiratory system, such as the cells lining the nose, throat, and trachea.
How Serious Can H1N1 Be?
For most healthy individuals, H1N1 can only cause mild, self-limiting infection that can be settled with supportive care such as adequate rest, fluids and treatment for symptoms.
Occasionally, it can lead to complications in the following people:
- Older adults
- Young children
- Pregnant women
- People living with conditions such as diabetes or other chronic illnesses.
While many people recover fully, in severe cases, influenza can affect the lungs and lead to complications such as pneumonia, low oxygen levels and serious breathing problems.
Although the confirmed cases are over 1,777 as of 25 August 2026, no deaths have been reported due to H1N1 so far. Health officials have said that there is no reason to panic, but it is important to pay attention to symptoms and know who is more vulnerable.
When Should You See a Doctor?
A mild fever, cough or body ache does not necessarily mean that someone has a serious infection. However, medical help should not be delayed when symptoms become severe or continue to worsen.
Seek urgent medical attention if there is:
- Difficulty breathing or noticeable breathlessness
- Rapid breathing
- Bluish lips or nails
- Confusion, unusual drowsiness or altered consciousness
- Difficulty eating or drinking
- Persistent vomiting
- Seizures, particularly in children
- Severe or worsening symptoms
People who are pregnant, very young, elderly or living with underlying health conditions should be more cautious and speak to a doctor early when they develop flu-like symptoms.
How is H1N1 Treated?
There is no single treatment that is required for every person with H1N1. The approach depends on how severe the illness is and whether the individual has any medical conditions that increase the risk of complications.
For many people with mild flu, treatment mainly involves getting enough rest, drinking plenty of fluids and managing symptoms such as fever and body aches.
Doctors may prescribe antiviral medicines such as oseltamivir for some patients, particularly those who are at higher risk or have more serious illness. These medicines should be taken only after consultation with a healthcare professional.
It is equally important not to start medicines on your own. Antibiotics do not treat influenza because H1N1 is caused by a virus, not bacteria. Steroids and antiviral medicines should also not be taken without medical advice.
How Can You Protect Yourself from H1N1?
With infections increasing in Delhi, everyday precautions can help reduce the chance of catching or spreading influenza.
- Wash your hands regularly, especially after returning from public places.
- Cover your mouth and nose when coughing or sneezing, and avoid close contact with someone who is sick.
- If you have flu-like symptoms, staying home and limiting contact with others can help prevent the infection from spreading.
- Wear a mask in crowded or poorly ventilated places.
- Eat well, stay hydrated, and get adequate sleep.
All these measures can help prevent the spread of virus and protect your health while infections are circulating.
Seasonal flu vaccination is another option for H1N1 swine flu infection for people who are at higher risk of complications. This may not necessarily prevent flu altogether but can reduce the risk of severe illness and complications.
To Sum Up
H1N1 (swine flu) is a seasonal flu virus that usually causes fever, cough, sore throat, body aches and tiredness. Most people get better with rest, fluids and time, but it can lead to complications for young children, older adults, pregnant women and those with chronic illnesses. Protect yourself by washing hands, wearing masks in crowded places, staying home when sick, and getting the seasonal flu vaccine if you are at risk. See a doctor if breathing gets hard or symptoms worsen.
