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Expert says Americans shouldn't be concerned about cutting time to produce COVID-19 vaccine

Vaccination efforts around the world are picking up steam. Meanwhile, Pfizer announced it expects to cut production time for its COVID-19 vaccine by nearly 50%. CBS News senior foreign correspondent Elizabeth Palmer has an update on the worldwide effort, and David Montefiori, a professor and director of Duke University's Laboratory for AIDS Vaccine Research and Development, joins CBSN's Lana Zak to discuss.
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