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Just a few years ago, a mosquito bite meant nothing more serious than a few days of itching to most Americans. But last summer the mosquito-borne West Nile virus, confined to the East Coast for its first three years in the U.S., swept across the country. More than 4,000 cases of West Nile disease were reported in 39 states in 2002, along with numerous milder cases of the virus. A total of 274 victims died, and many others were left with seemingly permanent disabilities, including a polio-like paralysis, severe muscle tremors, and overwhelming fatigue.
Also in 2002, researchers identified 20 confirmed cases of the virus that had been transmitted through blood ...