West Nile Virus

West Nile virus (WNV) is most often spread by the bite of an infected mosquito. Mosquitoes become infected when they feed on infected birds. Most people who become infected will not get sick. About 1 in 5 people who get infected will develop symptoms: fever, headache, body aches, joint pain, nausea or rash. Less than 1% of infected people will develop serious neurologic illness. For people who develop severe symptoms, recovery may take weeks to months. Some people will not recover. About 10% of people who develop neurologic illness will die. Symptoms begin between 3 and 14 days after being bitten by an infected mosquito.

Key Facts

West Nile virus is spread to people by infected mosquitoes.
You are at highest risk for getting infected with West Nile virus from June-September.
Outbreaks occur each summer, but we cannot predict how many cases will occur or where.
1 in 5 people infected with West Nile virus will develop symptoms like fever, headache, body aches, joint pain, nausea or a rash.
There is no vaccine available to protect you or your family from getting infected with West Nile virus.

Media

Brain Tissue Infected with WNV

DEET

Standing Water

Insect Repellent

Prevention Tips

Use insect repellent. Repellents containing DEET, picaridin, oil of lemon eucalyptus and IR3535 provide hours of lasting protection. Always follow the label instructions.
Wear long-sleeved shirts and long pants.
Keep mosquitoes out of your home. Use screens on windows and doors. Repair holes in screens to keep mosquitoes outside.
Once a week, empty and scrub, turn over, cover, or throw out any item that holds water, such as tires, buckets, planters, toys, pools, birdbaths, or trash containers. Check inside and outside your home

More at CDC.gov