Craig Carter

In this March 2021 photo provided by Pfizer, vials of the Pfizer-BioNTech COVID-19 vaccine are prepared for packaging at the company's facility in Puurs, Belgium. On Wednesday, Aug. 25, 2021, the company said it started the application process for U.S. approval of a booster dose of its two-shot COVID-19 vaccine  for people ages 16 and older. (Pfizer via AP)

For federal managers, new vaccine and testing policy brings anxiety — and more unanswered questions

Federal managers say key details of the administration’s vaccine and testing program are still unresolved, and they worry about enforcing a policy with…

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