Imagine you are enjoying the monsoon with splashes of rain, dull weather, and a soothing temperature that heals your emotions and well-being. In those days, your health risks increase rapidly due to high exposure to common viruses, bacteria, and infections that can suddenly disrupt your lifestyle, make you ill and weak, and require urgent medical attention. One of the most common diseases is dengue – a mosquito-borne viral infection that develops due to infected Aedes Aegypti mosquito bites. It affects large populations, especially during the monsoon, as mosquitoes breed more in the rainy season. 

In India, dengue outbreaks occur significantly every year, with a higher number of death cases that makes people more concerned about its progression. Dengue is basically mild in primary cases, rather it turn to severe condition and potentially lead to life-threatening health issues that need immediate medical attention.

What is dengue fever?

Dengue is caused by the bite of an infected Aedes aegypti or Aedes albopictus mosquito; both types are well adapted to live in close contact with humans. The dengue virus has four main strains (DENV -1 to DENV- 4) and can cause illness ranging from mild to severe. Some individuals may develop dengue fever with serious complications that require urgent medical care.

What Are the Types of Dengue Virus?

Dengue virus has four major serotypes: DENV-1, DENV-2, DENV-3, and DENV-4. Each serotype can cause anything from a mild febrile illness to severe dengue. 

The severity of infection is influenced by several factors, including a person’s immune response, previous dengue infection, and individual susceptibility—not simply by which serotype is involved.

• DENV-1: Often associated with typical dengue fever, including high fever, headache, muscle and joint pain, and fatigue. Bleeding manifestations may be absent or mild, although severe disease can still occur.
• DENV-2: May be associated with a higher risk of severe dengue, particularly in people with a previous dengue infection. Warning signs can include abdominal pain, persistent vomiting, bleeding, lethargy, and circulatory problems.
• DENV-3: Can produce a broad range of illness, from uncomplicated dengue fever to severe dengue with plasma leakage, bleeding, and circulatory complications. Severity may be influenced by previous exposure and the individual’s immune response.
• DENV-4: Like the other serotypes, DENV-4 can cause both mild and severe disease. In serious cases, patients may develop plasma leakage, low blood pressure, shock, or severe bleeding.

Dengue fever causes:

Finding the early symptoms of dengue, it’s not transmitted through human contact; rather, it spreads through dengue virus-infected mosquito bites. These mosquitoes breed in water-filled containers around homes and are active mainly during the daytime. Warm temperatures, rainfall, humidity, urbanisation, and stagnant water can increase mosquito breeding and dengue transmission. Rarely, dengue may also be transmitted through blood products, organ transplantation, or from an infected mother to her baby. 

A key feature of dengue infection is serotype-specific immunity. Infection with one of the four dengue virus serotypes (DENV-1 to DENV-4) generally provides lifelong protection against that same serotype, while immunity to the remaining serotypes is only temporary. Consequently, an individual can potentially experience dengue infection up to four times.

Importantly, a subsequent infection with a different serotype may increase the risk of severe dengue, including complications such as plasma leakage, bleeding, and shock.

What are the early symptoms of dengue?

As dengue is a viral infection, the common dengue symptoms in children and adults are similar to viral fever. 

• High fever
• Shievering
• Body ache
• Headache
• Muscle cramps
• Weakness
• Vomiting
• Rashes on skin
• Unwanted fatigue
• Loss of appetite
• Bleeding ( in rare cases)

Dengue infections can cause significant systemic inflammation and a marked reduction in energy, often leaving patients feeling more fatigued and unwell than with a typical cold or flu. If you develop symptoms suggestive of dengue, consult a doctor promptly and undergo appropriate blood tests at the earliest to confirm the diagnosis and assess disease severity. 

Difference between dengue fever and viral fever:

Although dengue fever and viral fever may present with similar symptoms, they are caused by different infections and require different approaches to dengue diagnosis and management. 

Viral fever can result from various viral infections and commonly causes fever, fatigue, body aches, headache, cough, and cold-like symptoms.

Dengue infection is caused by the dengue virus and is primarily transmitted through the bite of an infected Aedes mosquito. Common dengue fever symptoms include sudden high fever, severe headache, muscle and joint pain, weakness, and sometimes a skin rash.

As the infection progresses, low platelet count (thrombocytopenia) and increased hematocrit may occur. Severe dengue can result in bleeding, plasma leakage, shock, and organ complications.

Because dengue fever symptoms can overlap with other viral illnesses, symptoms alone cannot confirm dengue infection. Appropriate dengue test options, such as the NS1 antigen test, IgM/IgG antibody tests, and CBC with platelet count, can support dengue diagnosis and help monitor disease progression.

There is no specific antiviral dengue treatment; management primarily involves supportive medical care, adequate hydration, monitoring, and early recognition of warning signs. Dengue prevention focuses on avoiding mosquito bites and controlling Aedes mosquito breeding sites.

Dengue fever vs malaria symptoms: 

Dengue commonly presents with a sudden high fever accompanied by severe headache, pain behind the eyes, intense muscle and joint pain, nausea, vomiting, skin rash, and marked fatigue. In some cases, particularly as the fever begins to settle, warning signs such as persistent abdominal pain, repeated vomiting, bleeding or unusual bruising, and extreme weakness may develop.

Malaria, on the other hand, is often associated with episodes of fever accompanied by pronounced chills and shivering, followed by sweating. Patients may also experience headache, muscle aches, weakness, nausea, vomiting, and abdominal discomfort. Depending on the malaria parasite involved, fever episodes may occur at regular or irregular intervals.

How to prevent dengue exposures:

With dengue vaccination not part of routine immunisation in India, prevention primarily depends on mosquito-bite protection and Aedes mosquito control. These measures are particularly important during the monsoon and other periods of increased mosquito activity.

Now, what you should follow for dengue prevention:

• Apply mosquito repellents: Use EPA-registered repellents containing DEET, picaridin, or IR3535.
• Wear protective clothing: Choose long-sleeved shirts, full-length trousers, and light-coloured clothing to minimise exposed skin.
• Use physical barriers: Install window screens and use mosquito nets, particularly during daytime rest.
• Eliminate breeding sites: Regularly empty, clean, or cover stagnant-water containers such as coolers, buckets, flowerpots, and discarded vessels.
• Support vector-control measures: Participate in community source reduction, larval control, and mosquito-control programmes.
• Take travel precautions: In dengue-endemic areas, consistently use repellents, protective clothing, and screened accommodation.
• Dengue vaccination: Vaccines are available in some countries but are not currently part of routine dengue immunisation in India.

As there is no specific antiviral therapy for dengue, management primarily focuses on supportive care, early recognition of warning signs, and close clinical monitoring. Mosquito-bite prevention and effective vector control remain essential to reduce transmission and prevent infection.

Who are at high risk of dengue?

People who usually visit dengue-prone zones – urban to semi-urban areas- can be at high risk of dengue infection. Also, in areas where stagnant water is commonly found, dengue-infected mosquitoes breed more in clean stagnant water. Especially in children, older adults, and pregnant women, who have weakened immunity or chronic conditions, can have higher chance of dengue infection.

How long does dengue fever last? 

Basically, dengue fever lasts from 2 to 5 days with a high body temperature. If the signs of severe dengue conditions last more than 7 days, it’s better to consult a doctor immediately. People may feel better after 7 days of recovery, but some may have a critical condition if platelet counts get lower than normal; urgent hospitalisation is needed.

What platelet count is dangerous in dengue?

In dengue fever, a falling platelet count can be a warning sign, but the platelet number alone does not determine how severe the infection is. A platelet count below 100,000/µL is considered thrombocytopenia, while below 50,000/µL requires particularly close medical monitoring, especially if there are bleeding symptoms. 

Severe dengue can occur even without an extremely low platelet count. If dengue symptoms such as bleeding from the nose or gums, persistent vomiting, severe abdominal pain, blood in vomit or stool, or unusual drowsiness occur, seek immediate medical attention. 

Regular blood tests, including platelet and hematocrit monitoring, can help doctors assess the progression of dengue. 

Blood tests for dengue diagnosis:

If your symptoms are severe and the fever does not go away, then you should consult a doctor and get blood tests immediately as referred by him.

You may find various blood tests to confirm the level, presence, and severity. Accurate dengue diagnosis usually involves blood tests selected according to the stage of infection. 

• Dengue NS1 test is commonly used during the early phase of dengue fever.
• Dengue IgM test can help detect a more recent infection.
• Dengue IgG test may indicate previous exposure or, in some circumstances, a later-stage infection. 

A dengue platelet test is also important for monitoring platelet levels and assessing the patient’s condition, although platelet count alone does not confirm dengue. 

You may also check your whole blood count with a CBC blood test at Nirnayan Healthcare.

If you are wondering when to take a dengue test, the appropriate test depends on how many days have passed since fever began. Your dengue blood report should therefore be interpreted along with symptoms and clinical findings. 

For information on dengue test prices, contact Nirnayan Healthcare, the best lab chain across Kolkata and book your dengue blood tests here. 

A note from Nirnayan Healthcare:

In a recent study, it was noted that millions of people get dengue infection every year, and most cases are mild, and some of them do not have any such severe complications. Take preventive measures to reduce mosquito breeding, avoid mosquito bites, and if any symptoms are noticed, consulting a doctor can be essential.

Book your blood tests at Nirnayan Healthcare at a reasonable price and get a proper diagnosis of dengue disease.