West Nile Virus

West Nile virus is a contagious disease that first appeared in the United States in 1999. West Nile virus, a mosquito-borne illness, first emerged in the Western Hemisphere in 1999 in the New York City area and has since spread out across the United States. Most people contaminated with WNV will have no symptoms. About 1 in 5 people contaminated will develop a fever with other symptoms. Less than 1 percent of those infected will develop a significant, sometimes deadly, neurologic health problem. Most human infections are mild, triggering body, headache, and fever pains, often come with by a skin rash and inflamed lymph glands. If the virus goes across the blood-brain obstacle, nonetheless, it can cause deadly conditions that consist of inflammation of the brain and spinal cord. NIAID sustains research on WNV through its comprehensive emerging infectious disease program. This program supports research on bacterial, viral, and other types of disease-causing microbes.

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