Zika cases number in the hundreds here in the United States, while more than a million have contracted the virus in Brazil, and with tens of thousands of U.S. citizens expected to travel to the Olympics there in a few months, scientists here are racing against time in the event of an outbreak.
Dr. J. Thomas August has spent the last 40 years at Johns Hopkins and decades developing a way for people to fight off viruses.
He was already working on a vaccine to combat another mosquito-borne illness last year in Brazil, dengue fever, when he shifted his research to Zika.
"I have the vaccine and we're now... just today what the FDA will require of us to give us permission to start the human clinical trials," said August.
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