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China's Sinovac vaccine reportedly 50.4% effective in Brazilian trial
By Nee Lee & Yen Nee Lee
Biden receives second dose of coronavirus vaccine on camera
By Kate Sullivan
Doctor's Death After Getting the Covid-19 Vaccine Is Investigated
By Denise Grady & Patricia Mazzei
3 Bioethical Questions About COVID-19 Vaccines
By Rebecca Lynn Randall
Sinovac: Brazil results show Chinese vaccine 50.4% effective
By Philippa Roxby
Why You Should Still Wear A Mask And Avoid Crowds After Getting The COVID-19 Vaccine
By Joanne Silberner
Pfizer, BioNTech Boost Vaccine Output Goal by More Than 50%
By Riley Griffin & Naomi Kresge