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For the first time in over a year, the US records a daily average of fewer than 20,000 new Covid-19 cases
By Christina Maxouris, Holly Yan & Madeline Holcombe
Developed Countries Lock Up Covid-19 Vaccines Through 2023
By Jared S. Hopkins
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Second dose of AstraZeneca COVID-19 vaccine: FAQs about blood clots, safety, risks and symptoms
By Ishac Nazy & Dawn Bowdish
Moderna applies for full FDA approval of its Covid vaccine
By Berkeley Lovelace & Berkeley Lovelace Jr.
Moderna Seeks Full F.D.A. Approval for Covid Vaccine
By Daniel E. Slotnik
Canada recommends mixing and matching AstraZeneca, Pfizer and Moderna COVID-19 vaccines
By Adam Miller
Caught in a 'pickle,' millions of Americans might not have had an adequate response to the Covid-19 vaccine
By Elizabeth Cohen
India plans to more than triple COVID-19 vaccine shots per day
By Manas Mishra & Tanvi Mehta
How long do COVID vaccines take to start working?
By Jennifer Juno & Kylie M. Quinn