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If you got the Johnson & Johnson vaccine, do you need another dose?
By Akshay Syal, Jane Weaver & Patrick Martin
Two doses of Pfizer, AstraZeneca shots effective against Delta variant: study
By barbara lewis & Alistair Smout
COVID-19: Africa 'third wave' not yet over, while vaccine inequity threatens all
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Pfizer Shot Just 39% Effective Against Delta Infection, But Largely Prevents Severe Illness, Israel Study Suggests
By Robert Hart
J.&J. Vaccine May Be Less Effective Against Delta, Study Suggests (Published 2021)
By Apoorva Mandavilli
Israel says Pfizer Covid vaccine is just 39% effective as delta spreads, but still prevents severe illness
By Berkeley Lovelace & Berkeley Lovelace Jr.
South African firm to help make Pfizer/BioNTech COVID vaccine
By Michael Erman, Wendell Roelf & Alexander Winning
J&J forecasts $2.5 bln in 2021 COVID-19 vaccine sales, sets lower production target
By Manas Mishra & Carl O'Donnell
Israeli Data Suggests Possible Waning in Effectiveness of Pfizer Vaccine (Published 2021)
By Carl Zimmer
The Delta Variant, Covid-19 Symptoms and Vaccine Efficacy: What to Know
By Jared S. Hopkins & Robbie Whelan