Growing up in Nairobi, Kenya, Dr. Faith Osier often dreamed of curing the world of deadly diseases like malaria, an illness spread by mosquitos that kills more than 438,000 people every year. Several decades later, Osier, now 43, is at the forefront of the fight against malaria, spearheading the development of a vaccine that she believes could someday wipe out the disease. The swaying palm trees and pristine beaches of Kenya’s coastal town of Kilifi is a beach-lover’s paradise. But away from the white-sand beaches and crystal clear water waits a serious and often deadly parasite—one that caused more than 10 percent of all Kilifi residents to fall ill last year.

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