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Another problem I can foresee is a clinic is told how many doses they will get total and administers half that number which may be all of the doses they get on the first shipment. Then, two or three months later when it's time for people to get their second dose, the vaccine doesn't arrive. Then what?

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Pfizer, however, said that it has not experienced production issues. In a statement Thursday, the company said it shipped all 2.9 million doses of the vaccine the U.S. had allotted so far, and has millions more doses in warehouses ready to send. Those include doses being held for a required second shot, as well as a new batch set for delivery over the coming week.