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What COVID-19 cases after Capitol lockdown say about the first dose of the coronavirus vaccine

House Democrats are raising concern over safety measures on Capitol Hill after three lawmakers tested positive for COVID-19 following last week's deadly assault. All three had received their first dose of a coronavirus vaccine in recent weeks. Dr. Leo Nissola, a medical expert and immunotherapy scientist, joins CBSN to discuss what this tells us about the protection of a single jab.
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