Scientists have taken the first steps to developing a vaccine for chikungunya — an emerging mosquito-borne virus that has infected more than a half million people in the Western Hemisphere this year. About 600 Americans have brought the virus to 43 states.
The study was small. Only 25 people were given the experimental vaccine. But the findings are promising. They demonstrate that the vaccine is safe and that it triggers a strong response from the immune system, scientists reported Friday in the Lancet journal.
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