Dengue Fever risk in San Juan

Dengue Fever is a viral illness spread by Aedes mosquitoes that causes high fever, severe headache, joint and muscle pain, and in serious cases, bleeding and organ damage. There is no specific cure, making prevention essential. San Juan's tropical climate and frequent rainfall create ideal breeding conditions for Aedes aegypti mosquitoes. Urban areas with poor drainage, accumulated trash, and uncovered water containers are particularly vulnerable. The city's dense population and limited mosquito control resources contribute to a risk score of 64/100, meaning moderate to high transmission is ongoing. Five practical prevention steps for San Juan residents: Eliminate standing water weekly. Empty flowerpots, buckets, tires, and any containers collecting rainwater. Mosquitoes breed in just a few ounces of stagnant water. This single step removes most local breeding sites. Use repellent daily. Apply DEET, picaridin, or oil of lemon eucalyptus on exposed skin, especially during early morning and late afternoon when Aedes mosquitoes are most active. Reapply every few hours if outdoors. Install or repair window and door screens. Seal gaps in screens and walls. Use air conditioning when possible, as mosquitoes avoid cool indoor environments. Wear protective clothing. Long sleeves, long pants, and socks reduce exposed skin. Light-colored clothing may help, as mosquitoes are attracted to dark colors. Report breeding sites to local authorities. Contact the Puerto Rico Department of Health or municipal offices to report neglected areas, abandoned lots with standing water, or blocked drainage systems. Community reporting strengthens citywide control efforts. If you develop sudden high fever with severe headache or joint pain, seek medical care immediately. Early detection prevents complications. Avoid aspirin and ibuprofen, which can worsen bleeding risks associated with dengue.