A child comes home from school tired, and by evening the thermometer reads 102°F. The next morning, the fever is accompanied by headache, fatigue, and body pain. Is it dengue? Malaria? Or just a viral fever that will pass in a day or two?
For parents, this confusion is understandable. Dengue and malaria are both mosquito-borne diseases and co-circulate during the monsoon and post-monsoon months. Both diseases often begin with fever and overlapping symptoms such as headache, nausea, vomiting, stomach or digestive problems, and muscle or joint pain. This overlap can make the two illnesses difficult to distinguish based on symptoms alone. However, dengue and malaria are different diseases that need different treatment approaches and can become severe if not treated promptly.
What causes dengue and malaria?
Dengue is caused by a virus and is mainly spread through the bite of infected Aedes aegypti mosquitoes, while malaria is caused by a parasite transmitted through Anopheles mosquitoes. Their biting habits are also different. Aedes mosquitoes mainly bite during the daytime, while Anopheles mosquitoes generally feed between dusk and dawn.
Additionally, both mosquitoes breed in different types of stagnant water and environments. Aedes mosquitoes commonly breed in small amounts of stagnant water around homes, such as discarded tyres, tins, jars, scrap metal containers and water collected in plants. In contrast, Anopheles mosquitoes generally prefer clean, still water stored in places like overhead tanks, wells, drums, barrels, underground tanks, roof gutters, construction pits, fountains, and decorative water tanks.
How to differentiate between the symptoms
Although dengue and malaria may begin with similar symptoms, there are some differences that can help distinguish one from the other.
Fever in malaria is periodic in nature; it tends to come and go at specific times during a day, whereas fever in dengue tends to spike suddenly and does not come down easily. Intense and cyclical chills are a classic and primary symptom of malaria, rather than dengue.
Dengue, on the other hand, is known for intense muscle and joint pain; thus the disease is also known as breakbone fever. Skin rash is common in dengue but rare in malaria. Pain behind the eyes that worsens with eye movement is also a symptom specific to dengue.
Why timely diagnosis matters
Both dengue and malaria can progress rapidly to become severe if not diagnosed on time.
In dengue, parents need to remain watchful even when the fever begins to come down. Warning signs of severe dengue can often appear during the 24 to 48 hours after the fever subsides. Signs to watch out for severe dengue can include persistent vomiting, severe abdominal pain, bleeding from the nose or gums, unusual restlessness, extreme tiredness, or difficulty breathing. Severe dengue can worsen within a few hours and may require hospitalisation. Without timely treatment, severe dengue can be life-threatening.
Severe malaria can develop when the infection causes complications affecting vital organs, blood, or metabolism, particularly when diagnosis and treatment are delayed. Signs of severe malaria may include impaired consciousness or seizures, shock, breathing difficulties, kidney problems, abnormal bleeding, jaundice, severe anemia, or a very high level of parasites in the blood.
To avoid complications, it is very important to take timely medical intervention. Dengue and malaria need different approaches to treatment. Knowing which infection a child has, also matters because dengue and malaria are treated very differently.
Treatment protocol:
Malaria can be treated with specific antimalarial medicines. Early diagnosis, followed by appropriate antimalarial treatment, is therefore an important part of malaria management.
However, dengue currently has no specific antiviral treatment. Care is largely supportive, with focus on hydration, close monitoring, and managing complications as the illness progresses. This difference also makes preventing dengue infection particularly important. Rather than relying on any single measure, protection needs to begin before a person becomes infected.
Prevention needs more than one layer
The first step is reducing exposure to mosquito bites. Since dengue-spreading Aedes mosquitoes mainly bite during the day, while malaria-spreading Anopheles mosquitoes are generally active between dusk and dawn, protection is needed across the day and night.
Using mosquito repellents, wearing clothing that covers the arms and legs, and using screens on doors and windows where possible can help reduce the risk of mosquito bites. Reducing mosquito breeding is equally important. Water should not be allowed to remain stagnant in and around homes, water-storage containers should be kept covered, and potential breeding sites should be regularly checked and removed.
For dengue, since there is no specific treatment and the disease can be unpredictable, prevention remains important. Alongside mosquito-control measures, vaccination, where appropriate, may form part of an integrated dengue prevention approach in eligible populations.
It is also important to remember, dengue and malaria may look similar at first, but they are different diseases that require different approaches. Recognising concerning symptoms, seeking timely medical care and taking preventive measures against mosquito-borne infections can together help reduce the risk of severe disease.
(The author is a consultant paediatrician at Sagar Hospitals, Bengaluru)
The opinions expressed in this article are those of the author and do not purport to reflect the opinions or views of THE WEEK.
