West Nile season is off to an early, active start across the U.S.

West Nile virus is showing up early enough this summer that public-health officials are already urging people to change their outdoor routine. The CDC’s current-year surveillance page, updated June 30, shows the season is still building and the numbers are preliminary, but the signal is clear: activity is broad and earlier than usual. AP reported July 1 that this is the earliest and worst start to the West Nile season in more than two decades.

According to the CDC, at least 48 cases had been confirmed as of June 30, including 38 severe cases. Federal health officials also said 23 states had reported finding West Nile virus. That does not mean every state has the same level of risk, and it does not mean the count is final. The CDC says the data can lag state and local reporting, so the national map should be read as an early surveillance snapshot, not a completed tally.

What to do now

The practical prevention advice is simple. Use an insect repellent registered with the Environmental Protection Agency, wear long loose-fitting shirts and pants, avoid being outside from dusk to dawn when mosquitoes are most active, and use screens on windows and doors or air conditioning when you can. Those steps will not eliminate risk, but they can reduce the chance of a bite during peak mosquito season.

What symptoms to watch for

Most people infected with West Nile never develop symptoms. Some develop a flu-like illness with fever, headache, body aches, joint pain, vomiting, diarrhea, or rash. Severe illness is rare, but it can affect the nervous system and lead to hospitalization or death. If a possible mosquito exposure is followed by high fever, neck stiffness, muscle weakness, confusion, or tremors, medical care should not wait.

Older adults and people with certain chronic conditions face higher risk of severe illness. For most readers, the main takeaway is not panic but timing: mosquito precautions matter now, especially for evening activities, outdoor work, travel, and holiday gatherings.

Sources

• CDC — West Nile Virus Current Year Data (June 30, 2026)
• Associated Press — CDC urges people to prevent mosquito bites as West Nile virus spreads (July 1, 2026)