Johns Hopkins University Study: New Dengue Vaccine Could Cause Serious Illness

A new study shows a vaccine designed to prevent dengue fever could actually be making people sick.

Dengue infects an estimated 400 million people worldwide each year. The virus spreads to human beings through the bite of an insect, the mosquito.

Most people who get dengue suffer health problems like those resulting from a mild case of influenza, like a higher than normal body temperature.

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