Full CoverageStudy: 2 COVID vaccine doses much more effective than 1 against Delta
By Mary Van Beusekom
Top news
Pfizer will turn to a plant in Africa to help supply the continent with vaccines next year. (Published 2021)
By Rebecca Robbins
If you got the Johnson & Johnson vaccine, do you need another dose?
By Jane Weaver & Akshay Syal
Two doses of Pfizer, AstraZeneca shots effective against Delta variant: study
By barbara lewis & Alistair Smout
All coverage
Israeli Data Suggests Possible Waning in Effectiveness of Pfizer Vaccine (Published 2021)
By Carl Zimmer
J&J forecasts $2.5 bln in 2021 COVID-19 vaccine sales, sets lower production target
By Manas Mishra & Carl O'donnell
Biden administration purchases extra Pfizer doses to prepare for possibility of children vaccine needs and booster shots
By Betsy Klein & Naomi Thomas
The Delta Variant, Covid-19 Symptoms and Vaccine Efficacy: What to Know
By Jared S. Hopkins & Robbie Whelan
Israel says Pfizer Covid vaccine is just 39% effective as delta spreads, but still prevents severe illness
By Berkeley Lovelace & Berkeley Lovelace Jr.
J.&J. Vaccine May Be Less Effective Against Delta, Study Suggests (Published 2021)
By Apoorva Mandavilli