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What we can learn from past vaccine breakthroughs
This version of What We Can Learn From Past Vaccine Breakthroughs 83889733530 - Breaking News | NBC News Clone was adapted by NBC News Clone to help readers digest key facts more efficiently.
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The world is anxiously waiting for a coronavirus vaccine. If history tells us anything, it might be a while before we see any big breakthroughs. NBC News’ Dr. John Torres takes us through the major vaccine victories of the past.May 25, 2020
