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Double-Shot Covid Vaccines Multiply Immunization Challenges
By Robert Langreth, James Paton & Stephanie Baker
Some Vaccine Makers Say They Plan to Profit From Coronavirus Vaccine (Published 2020)
By Katherine J. Wu
AstraZeneca confirms Russia vaccine deal days after COVID-19 hacking accusations surface
By Kyle Blankenship
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New data offer glimpse of efficacy of Oxford-AstraZeneca Covid-19 vaccine
By Helen Branswell, Matthew Herper & Damian Garde
Why vaccines are less effective in the elderly, and what it means for COVID-19
By Byram Wayne Bridle & Shayan Sharif
A COVID-19 Vaccine Reality Check
By Sarah Zhang