H1N1, COVID-19 and Dengue: Key differences

Fever is the body’s primary alarm system. It tells us something is wrong, but it doesn’t tell us exactly what the problem is. This becomes especially puzzling when diseases such as H1N1 (swine flu), COVID-19, and dengue are spreading at the same time.

According to a study published in “Scientific reportsThese three factors can cause fever, headache, fatigue, and body aches, making it tempting to assume that any high fever is just the flu.

But this assumption can be risky.

“Fever is the body’s most primitive alarm bell, but in today’s world it can signal any number of diseases,” he says. Dr. Tushar Tayal, Assistant Director, Internal Medicine, CK Birla Hospital, Gurugram. He notes that distinguishing between H1N1, COVID-19 and dengue is important because the diseases have different causes, treatments and potential complications.

Why do people get confused about this?

The first few days can look remarkably similar.

A person may experience fever, weakness, headache, muscle pain, and loss of appetite with any of the three. Some people may also experience nausea or other digestive symptoms.

• The biggest difference is how diseases spread and what happens after the initial fever.
• H1N1 and COVID-19 are respiratory viral infections that spread mainly through respiratory particles. Dengue, on the other hand, is spread by infected Aedes mosquitoes.

This means that a person who develops a fever after exposure to mosquitoes should be viewed differently than someone who develops a fever after close contact with someone with a respiratory infection.

H1N1

H1N1 influenza often starts suddenly And not gradually. Typical symptoms include:

• High temperature and chills
• Dry cough
• sore throat
• headache
• Noticeable muscle pain
• Fatigue and weakness
• Sometimes nausea, vomiting or diarrhea

According to Dr. Tayyal, sudden onset and obvious muscle pain can be a useful clue. Symptoms may become especially severe during the first few days.

Unlike dengue, H1N1 is usually accompanied by respiratory symptoms such as cough and sore throat.

However, symptoms alone cannot confirm influenza infection. Influenza testing, especially molecular testing when indicated, can help determine the diagnosis.

People who are most at risk of complications, including the elderly, young children, pregnant women and those with certain underlying medical conditions, should seek medical advice early if flu is suspected.

Read also: Can you get infected with H1N1 twice? What happens after a previous infection or vaccination?

Covid-19

According to a study published in International Journal of Infectious DiseasesCOVID-19 can significantly overlap with influenza.

Fever, cough, fatigue, headache, and body aches are common, but symptoms can vary greatly from person to person.

Loss or change in the sense of smell and taste have become particularly common symptoms of coronavirus (COVID-19), although they are less common with some of the newer variants than they were earlier in the pandemic.

Some people experience shortness of breath or chest discomfort, while others may experience mainly fatigue, headaches, or gastrointestinal symptoms.

Another important difference is the pattern of disease. Symptoms of COVID-19 may develop gradually and can range from very mild illness to severe respiratory illness.

Dr. Tayyal points out that people should not assume that Covid-19 He was excluded simply because they had no cough or breathing problems.

Testing is important when the result leads to a change in isolation, treatment, or clinical management. Depending on the condition, this may include a rapid antigen test or a molecular test such as RT-PCR.

Dengue fever

It may be especially difficult to distinguish between dengue fever and influenza or COVID-19 during the first few days. A typical presentation includes:

• Sudden rise in temperature
• Severe headache
• Pain behind the eyes
• Severe pain in muscles and joints
• Nausea or vomiting
• weakness
• Sometimes a skin rash

Severe pain in the muscles and joints Pain associated with dengue fever It has earned it the nickname “Bone Broken Fever.”

The appearance of a rash a few days after illness can provide another clue, but it is not present in everyone.

One of the most important differences is what can happen when a fever begins to settle. Dengue fever can enter a critical phase around the time the fever subsides, where plasma leakage and bleeding can develop in severe cases.

Warning signs include severe abdominal pain, persistent vomiting, bleeding from the gums or nose, blood in the vomit or stool, severe weakness, restlessness, or difficulty breathing.
These symptoms require urgent medical evaluation.

Read also: From smallpox to Covid-19: The deadly epidemics that changed India

Does a high fever tell you what illness you are suffering from?

Not reliably; It is a common misconception that the higher the temperature, the greater the likelihood of contracting dengue or influenza. In fact, the severity of fever varies between individuals and infection cannot be reliably determined.

Likewise, the absence of a particular symptom does not rule out the disease.

A person with COVID-19 may not have respiratory symptoms. A person with dengue fever may not develop a rash. A person with influenza may experience gastrointestinal symptoms.

For this reason, examining symptoms alone has limitations.

What tests are used?

Because symptoms overlap, tests may be needed to determine the cause.
According to a report published in Search portal:

• For COVID-19, rapid antigen tests and molecular tests such as RT-PCR may be used, depending on the circumstances.
• For influenza, including H1N1, molecular tests are generally more sensitive, while some rapid influenza tests can provide faster results but may miss infections.
• For dengue, the choice of test depends partly on how long a person has been sick.
• Molecular or NS1 antigen tests can help detect infection early, while antibody testing becomes more useful later in the disease.
• Blood counts, including platelet and hematocrit measurements, can help doctors monitor dengue fever and identify changes, but a low platelet count by itself does not prove that someone has dengue fever.

“Misdiagnosis is not only annoying; in the case of dengue fever, it can delay proper monitoring, and in severe cases, it can be dangerous,” says Dr. Tayyal.

When do you see a doctor?

Do not rely on the assumption that a fever It is “just viral,” especially if it persists or gets worse. Medical advice is especially important if the fever is accompanied by:

• difficulty breathing
• Severe or persistent abdominal pain
• Repeated vomiting
• Unusual bleeding or bruising
• Confusion, extreme drowsiness or fainting
• Severe weakness
• Decreased urine output
• Symptoms that improve briefly and then become worse

People who are pregnant, elderly, very young, or have chronic diseases should also have a lower threshold for seeking medical advice.

Seasonal diseases and seasonal diseases

Dengue fever is strongly associated with the rainy season because stagnant water provides breeding sites for the Aedes mosquito. But dengue fever is not limited to the monsoon.

Warm, humid conditions can allow mosquito populations to persist beyond the traditional rainy season. Therefore, a fever that occurs outside the monsoon season should not be automatically assumed to be influenza or COVID-19.

Likewise, influenza and COVID-19 can circulate at different times and may overlap with mosquito-borne diseases.

The final word

H1N1, COVID-19 and dengue viruses may start with the same warning sign: fever, but the illnesses are very different. Recognition of differences should encourage timely medical evaluation rather than self-diagnosis. Proper testing, combined with a doctor’s examination and knowledge of local disease patterns, is much more reliable than trying to identify infection from fever alone.