The Boston-based company sees a 60% probability of a vaccine by December and 80% by mid-2021, said George Mussalli, head of research and chief investment officer for equities.”

“Investors should prepare for “big disappointments and big surprises on the plus side” along the approval process,” Mussalli said in an interview on Wednesday. “Those news events are going to move the market considerably up and down until the vaccine is found and made widely available.



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