Results Are Promising in Clinical Trial of Dengue Fever Vaccine

Employees in the vaccine unit at the Sanofi Pasteur plant near Lyon, France. Credit Robert Pratta/Reuters
The French pharmaceutical company Sanofi said on Monday that its experimental vaccine for dengue fever had succeeded in its first late-stage clinical trial. The results could help pave the way for the introduction of the first vaccine to prevent a disease that afflicts an estimated 50 million to 100 million people a year.