Dengue Fever: Symptoms, Causes, and Prevention
Dengue fever, a mosquito-borne tropical and subtropical disease caused by any of four different serotypes of the dengue virus, poses a significant health threat to over half of the world’s population. légerly over half of the world’s population lives in areas at risk for the disease, which is prevalent in regions like South and Central America, Africa, parts of Asia, and the Pacific islands.
Symptoms and Causes
While many dengue infections do not exhibit symptoms, the most common signs include high fever (up to 40°C), skin rashes, severe headache, nausea, vomiting, muscle and joint pains, and pain behind the eyes. Some people may also experience pain in their chest, stomach, or bones. These symptoms typically appear four to ten days after being bitten by an infected mosquito and may last up to seven days. About one in twenty people with dengue may develop severe dengue, which can be life-threatening if not treated promptly.
Severe dengue symptoms usually occur after the initial symptoms have resolved, typically within 24 to 48 hours. Severe dengue is marked by severe abdominal pain, persistent vomiting, frequent bloody stools, bleeding gums, nose or ear, and severe restlessness or irritability. It requires immediate medical attention, as it can lead to a serious buildup of fluid in the lungs, shock, or internal bleeding – conditions that can be fatal.
Dengue fever is caused by any of the four dengue virus serotypes (DENV 1-4). Mosquitoes become infected when they feed on a person already infected with the dengue virus. Infected mosquitoes can then spread the virus to other people through bites. Unlike diseases like influenza, dengue is not contagious from person to person. However, severe dengue has been reported to be mildly contagious via blood transfusions or from mother to child during pregnancy or delivery.
Diagnosis and Treatment
A blood test is used to diagnose dengue. The test detects antibodies against the dengue virus and can also identify which virus serotype is causing the infection. Additionally, the test can help rule out other viruses that cause similar symptoms, such as Zika or chikungunya. There is no specific medicine to treat dengue, but hospitalization may be required for severe cases. Medical professionals typically recommend managing symptoms and ensuring proper hydration to help patients recover at home. Avoid taking ibuprofen or aspirin, as they can increase the risk of bleeding, a serious complication of severe dengue.
Prevention
The best ways to prevent dengue fever are:
- Avoid mosquito bites: Wear long-sleeved clothing and use insect repellents containing DEET when outdoors or in poorly ventilated areas.
- Remove standing water: Mosquitoes lay their eggs in standing water. Regularly check your surroundings for potential breeding sites such as old tires, buckets, or flower pots, and remove or change the water weekly.
- Install screens: Install window screens and ensure doors are slammed tightly to keep mosquitoes from entering homes.
- Use mosquito nets: If sleeping in an area with a high risk of dengue, use a mosquito net around your bed.
Currently, no dengue vaccine is available for widespread use. Vaccination is only recommended for individuals aged 9 to 45 who have had a previous dengue infection, as it can increase the risk of developing severe dengue upon infection with a new virus serotype. Always consult a healthcare professional for personalized advice regarding dengue vaccination.
