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COVID numbers have doubled in Sonoma County this month and this week there has been a reported outbreak at Santa Rosa's Samuel Jones Hall Homeless Shelter, where over half the residents tested positive and almost half of those were fully vaccinated. KRCB's Tessa Paoli talks with UC Berkeley infectious disease and vaccine expert Dr. John Swartzberg to understand how breakthrough infections happen:
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July 18, 2021 at 12:34AM
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How do COVID breakthrough infections occur? One expert explains - KRCB
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