H1N1 Cases Rise in Delhi and Bengaluru: How Is Swine Flu Different From COVID-19?
Delhi has reported 1,777 H1N1 cases so far this year, a sharp rise from last year’s numbers. With influenza cases also increasing in Bengaluru and other cities, experts explain how swine flu differs from COVID-19 and why symptoms alone cannot confirm which infection a person has.
New Delhi, August 24, 2026: H1N1 influenza, commonly known as swine flu, is seeing a significant increase in cases in several Indian cities, including Delhi and Bengaluru. The rise has renewed concerns about seasonal influenza and has also led many people to wonder how they can distinguish swine flu from COVID-19, since both illnesses can cause very similar symptoms.
According to data from the National Centre for Disease Control (NCDC), Delhi recorded 1,777 H1N1 cases up to August 20 this year, compared with 229 cases during the same period last year. The sharp increase has prompted hospitals in the national capital to strengthen their preparedness for influenza patients and possible complications. Bengaluru and Kolkata have also reported recent increases in cases.
However, health authorities have stressed that there is no need for widespread panic. The Indian Council of Medical Research (ICMR) has said the recent rise is not linked to a new H1N1 strain.
H1N1 and COVID-19: Why Are They Difficult to Tell Apart?
Both H1N1 and COVID-19 are respiratory infections and can produce symptoms such as fever, cough, sore throat, tiredness and body aches. Because of this overlap, it is difficult to determine the infection simply by looking at the symptoms.
Dr Niraj Kumar, Senior Consultant in Internal Medicine at ShardaCare-HealthCity, explained that although the two illnesses are caused by different viruses, their symptoms can look remarkably similar.
H1N1 is caused by an influenza A virus, while COVID-19 is caused by the SARS-CoV-2 coronavirus. Since the viruses are different, their testing and treatment can also differ.
Symptoms May Offer Clues, But Cannot Confirm the Infection
Flu often comes on suddenly. People may develop fever, dry cough, headache, sore throat, muscle or joint pain and pronounced tiredness.
COVID-19 can have a wider range of symptoms. These may include fever, chills, cough, sore throat, fatigue, headache, muscle aches and a blocked or runny nose. Some people may also experience changes in their sense of taste or smell, while nausea, vomiting or diarrhoea can occur in some cases.
Influenza generally has a shorter incubation period, with symptoms commonly appearing about two days after infection, although the period can range from one to four days. COVID-19 can have a different incubation pattern, which has also varied with circulating variants.
Still, these differences are only useful as clues. They are not enough to diagnose the illness.
Testing Can Help Identify the Infection
Since the symptoms overlap, doctors may recommend testing when knowing the exact cause could affect treatment or medical management.
COVID-19 can be confirmed using molecular or antigen-based tests, while influenza can be identified through respiratory samples and laboratory testing. The choice of test may depend on a person’s symptoms, risk factors, the severity of the illness and which viruses are circulating locally.
Treatment for H1N1 and COVID-19 Is Different
Another important difference is treatment. Antiviral medicines used for influenza are not automatically effective against COVID-19.
For influenza, doctors may prescribe medicines such as oseltamivir, particularly for people at higher risk of complications, those with severe illness or certain hospitalised patients. These medicines work best when started early, ideally within 48 hours of symptoms appearing.
COVID-19 treatment depends on the severity of the infection and the patient’s risk of developing serious illness. For certain high-risk patients, doctors may consider specific COVID-19 antiviral medicines.
One important point is that antibiotics do not treat either H1N1 or COVID-19. They may only be needed when a bacterial infection is also present.
Who Needs to Be More Careful?
Both infections can become serious, particularly among people who are more vulnerable to complications.
Pregnant women, older adults, young children and people living with certain chronic conditions are among those who may face a higher risk from influenza. COVID-19 can also be more severe in older adults and people with conditions such as diabetes, heart disease, chronic lung or kidney disease, cancer, obesity or weakened immunity.
Both infections can potentially lead to complications, including pneumonia and severe respiratory illness.
When Should You Seek Medical Help?
Most mild respiratory infections can often be managed with rest, adequate fluids and symptom-based care under medical guidance. However, symptoms that become severe or worsen should not be ignored.
Medical attention should be sought promptly if a person develops difficulty breathing, chest pain or pressure, confusion, unusual drowsiness, bluish or unusually pale skin, or falling oxygen saturation. People at higher risk of complications should be particularly cautious if their respiratory symptoms worsen.
The Bottom Line
The rise in H1N1 cases across cities such as Delhi and Bengaluru is a reminder that seasonal influenza remains an important respiratory illness.
Although swine flu and COVID-19 can look very similar in the beginning, they are caused by different viruses and may require different tests and treatments. The safest approach is not to diagnose yourself based only on symptoms.
If fever, cough or other respiratory symptoms are severe, persistent or getting worse—especially in someone at higher risk—consulting a healthcare professional and getting appropriate testing can help identify the infection and ensure timely treatment.
News source: Information for this article was gathered from a variety of reliable news outlets.
