"Infection with one strain of the dengue virus gives people protection against the other three strains for about two years, a new biostatistics study has found.
That information should help researchers trying to develop vaccines against the mosquito-borne virus, which is nicknamed “break-bone fever” for the joint pain it causes.
Dengue infects 5 percent of the world’s population each year, and its range is increasing. In 2009 it was found in Florida for the first time in decades, and earlier this year the Centers for Disease Control and Prevention said it had re-established itself there, although no cases have been confirmed since 2010."
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