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Anthony Fauci, a leading expert in the U.S. government’s response to the coronavirus pandemic, expressed cautious optimism on Tuesday that several successful vaccine candidates would prove effective “within a reasonable period of time” to fight the novel pathogen. But how long the protection from an eventual vaccine might last is “a big unknown,” he said via remote video during The Wall Street Journal’s Tech Health Conference. A short duration of protection could create additional challenges, he said….
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