Why Are Dengue-Carrying Mosquitoes Expanding Their Range?
Mosquitoes that transmit dengue — primarily Aedes aegypti and Aedes albopictus — are spreading into new geographic areas beyond their traditional tropical and subtropical habitats. Local transmission cases have been reported in parts of Florida, raising concerns among public health officials.
Key drivers of this trend include:
- Climate change: Shorter winters and rising temperatures allow mosquitoes to survive farther north;
- Urbanization and standing water: Discarded tires, flower pot saucers, and drainage ditches create ideal breeding sites;
- Global travel and trade: Accelerating the cross-regional spread of mosquitoes and viruses.
How Does Dengue Spread?
Dengue is caused by dengue virus and is primarily transmitted through the bite of an infected Aedes mosquito. Importantly, it does not spread through direct person-to-person contact. When a mosquito bites a person during the viremic phase and later bites a healthy individual, infection can occur.
What Are the Symptoms of Dengue?
The incubation period is typically 4 to 10 days. Common symptoms include:
- Sudden high fever (up to 40°C / 104°F)
- Severe headache and pain behind the eyes
- Muscle and joint pain (hence the nickname "breakbone fever")
- Nausea, vomiting, and rash
Most patients improve within a week, but a minority develop severe dengue, with warning signs such as persistent vomiting, abdominal pain, gum or nose bleeding, blood in vomit, black stools, drowsiness, or restlessness — requiring immediate medical attention.
How to Prevent Mosquito Bites Effectively
- Eliminate standing water: Check and empty flower pot saucers, buckets, and pet water bowls weekly;
- Use repellent: Choose products containing DEET, picaridin, or oil of lemon eucalyptus;
- Wear protective clothing: Long sleeves and pants outdoors, especially at dawn and dusk;
- Install window screens: Keep mosquitoes out of your home;
- Check travel advisories: Take extra precautions when visiting dengue-endemic areas.
When Should You See a Doctor?
If you develop high fever, severe headache, or joint pain after being bitten in an area with active mosquito transmission, seek medical care promptly and inform your doctor of your travel history. Avoid taking ibuprofen, aspirin, or other NSAIDs on your own, as they may increase bleeding risk.
Beyond daily prevention, tracking your health metrics matters. The Xiaoshu Health App can sync with Apple Health to track relevant indicators, helping you log temperature, heart rate, and other changes — providing more complete health data when you see a doctor.