

West Nile Virus

What Are the Symptoms of WNV?
WNV affects the central nervous system. Symptoms vary.

  • Mild Symptoms in Some People. Up to 20 percent of the people who become infected will display mild symptoms, including fever, headache, and body aches, nausea, vomiting, and sometimes swollen lymph glands or a skin rash on the chest, stomach and back. Symptoms typically last a few days.

How Does It Spread?


How Soon Do Infected People Get Sick?

How Is WNV Infection Treated?

What Should I Do if I Think I Have WNV?
Mild WNV illness often improves on its own, and people do not necessarily need to seek medical attention for this infection, however it is always best to check with your physician, if uncertain. If you develop symptoms of severe WNV illness, such as unusually severe headaches or confusion, seek medical attention immediately. Severe WNV illness usually requires hospitalization. Pregnant women and nursing mothers are encouraged to talk to their doctor if they develop symptoms that could be WNV.

What Is the Risk of Catching WNV?
For most, risk is low. Less than 1 percent of people who are bitten by mosquitoes develop any symptoms of the disease and relatively few mosquitoes actually carry WNV. People over the age of 50 are more likely to develop serious symptoms of WNV if they do get sick and should take special care to avoid mosquito bites.

For More information on WNV:
Centers for Disease Control - West Nile Virus Home Page