Mosquito-borne illnesses increasing in US. See map of affected states

Key Points:

• This summer has seen a significant rise in mosquito-borne diseases in the U.S., with Western states experiencing a surge in West Nile virus and the South facing increased dengue fever cases, prompting public health warnings.
• West Nile virus cases reached a more than 20-year high by early September, with 504 confirmed cases across 41 states, including 363 severe neuroinvasive cases, driven by warmer temperatures and longer mosquito seasons.
• Most people infected with West Nile virus show no symptoms, but severe cases can cause serious neurological conditions; older adults and those with weakened immune systems are at higher risk.
• Prevention strategies include using EPA-approved insect repellents, eliminating standing water to reduce mosquito breeding, and seeking professional pest control if necessary.
• Dengue fever cases in Florida have more than doubled compared to the previous year, raising concerns about other mosquito-borne diseases like chikungunya and Zika potentially gaining footholds in the U.S. due to changing environmental conditions.