As U.S. Faces Out-of-Control Pandemic, Pfizer Raises Hope for Vaccine, But Many Questions Remain

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Pharmaceutical giant Pfizer has announced that a Phase 3, late-stage study found their potential COVID-19 vaccine showed more than 90% effectiveness. The two-dose vaccine still faces several challenges, including how to store and transport it, since it must be refrigerated at subzero temperatures. Pulitzer Prize-winning science journalist Laurie Garrett says the news is hopeful, but urges caution. “There’s been no scientific release. There’s no published data,” she says. “We don’t have anything to go with except what the lawyers at Pfizer massaged carefully into a single-page press release. So, we have to take that with a big caveat.”

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