The news about the future of the Covid-19 crisis is really promising. This image shows Sharp HealthCare caregivers celebrating after patient Carlos Alegre received the Pfizer-BioNTech COVID-19 vaccine on December 21, 2020 in Chula Vista, California.
Credit: Mario Tama/Getty Images
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Reasons for cautious optimism amid Covid-19 crisis: 'The news about the future' is really promising
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