We just got our first human results for a coronavirus vaccine. Here are the 5 biggest questions we still need answered about Moderna's injection. (MRNA)

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• The first human results for a coronavirus vaccine candidate were released Monday.
• They carried promising, albeit early, signs that the vaccine developed by Moderna may wind up working and help prevent infection.
• But the Massachusett…

  We just got our first human results for a coronavirus vaccine. Here are the 5...