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Sanofi Takes Aim at Dengue Fever

It's the fastest-growing tropical disease, killing an estimated 20,000 people a year. Nearly half the world's population is at risk of contracting dengue fever. 100 million people each year are infected according to the World Health Organisation. France's Sanofi has been developing a dengue vaccine for the past 20 years. Now a large clinical study in five Asian countries showed the three-dose vaccine provides moderate protection against the disease.

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