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Most people with West Nile Virus (WNV) may not have symptoms or have only a mild illness. However, the illness caused by West Nile virus may be serious and may include encephalitis, inflammation of the brain, or meningitis. People may become ill 3 to 15 days after the bite of an infected mosquito.

Common Signs & Symptoms

Common signs and symptoms of West Nile virus infection include:

  • Backache
  • Headache
  • Mild illness with fever
  • Muscle aches
  • Skin rash
  • Swollen lymph glands

Encephalitis Signs & Symptoms

See your doctor as soon as possible after you experience signs and symptoms that might suggest West Nile encephalitis. Although most people infected with the virus recover fully, the virus can result in serious, life-threatening illness. Encephalitis is an inflammation of the brain that may be marked by:

  • Coma
  • Convulsions
  • Disorientation
  • High fever
  • Muscle Weakness
  • Paralysis
  • Severe Headache
  • Stiff neck
  • Stupor
  • Tremors

After business hours

Klamath County Public Health may be reached after hours, on an emergency basis, at 541-891-2015.