Science and health experts are bullish on the news about the Pfizer and BioNTech coronavirus vaccine candidate.
The main reason for the excitement is the vaccine looks like it's on pace to fly right past the Food and Drug Administration's 50 percent efficacy threshold, according to its interim analysis, which pegged the rate at 90 percent so far. There's more good news between the lines, though — the companies say they haven't observed any safety concerns among trial volunteers, the immune response should last for up to a year, and it's unlikely any mutations would be able to overcome the immune response.
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