Vermont health officials are renewing their warnings about mosquito-borne West Nile virus. The virus can cause a range of reactions ranging from nothing to fatal brain swelling. It was first discovered in the United States in 1999.
In Vermont last year, 125 birds were found to have died with the virus, five horses were infected and one person fell ill. Birds carry the West Nile virus, which is transmitted to humans through mosquito bites.