dengue

Imagine you’re traveling in a warm, rainy place where mosquitoes are common. One bite can carry a hidden danger: the dengue virus. Dengue isn’t just a bad cold; it’s an illness spread by mosquitoes that can bring on a high fever, a strong headache, and intense muscle and joint pain (which is why some people call it “breakbone fever”). It’s common in many tropical and subtropical parts of the world. Most cases get better with rest and fluids, but some become severe and need urgent medical care. So, when traveling to risk areas, protecting yourself from mosquito bites is crucial.

Dengue is a viral infection transmitted to humans through the bite of infected Aedes mosquitoes—especially Aedes aegypti and, to a lesser extent, Aedes albopictus. In everyday life, it usually does not spread directly from person to person. Instead, the mosquito acts as a vector, carrying the virus from one person to another. (Rarely, transmission can happen through blood products, organ transplants, or from a pregnant person to a baby.)

Dengue occurs in many tropical and subtropical regions worldwide. Symptoms typically appear 4–10 days after a bite and can range from mild flu-like illness (fever, headache, pain behind the eyes, body aches, and sometimes a rash) to severe dengue. Severe dengue can involve bleeding, organ problems, and shock, and it can be life-threatening.

There are four distinct serotypes of the dengue virus (DENV-1, DENV-2, DENV-3, and DENV-4). Infection with one serotype provides lifelong immunity against that specific type but only temporary partial protection against the others. Crucially, subsequent infections with different serotypes increase the risk of developing severe dengue.

Currently, there is no specific antiviral treatment for dengue. Care focuses on managing symptoms and preventing dehydration, and severe cases may need hospital treatment. Prevention relies heavily on controlling mosquito populations—such as removing breeding sites like standing water—and personal protective steps like using insect repellent, wearing long sleeves and pants, and using screens or bed nets. Public health campaigns are vital in at-risk areas to help people prevent infection and recognize warning signs early.