As Massive Zika Vaccine Trial Struggles, Researchers Revive Plan to Intentionally Infect Humans

September 13, 2018

(Science) – In 2016, as the mosquito-borne Zika virus spread through the Americas and cases of infected women having brain-damaged babies mounted, investigators raced to develop a vaccine. Now, a $110 million vaccine trial is underway at 17 sites in nine countries, but it faces an unexpected, and ironic, challenge. Cases of Zika have plummeted to levels so low that most people vaccinated in the trial likely will never be exposed to the virus, which could make it impossible to tell whether the vaccine works.

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