Why vaccines are less effective in the elderly, and what it means for COVID-19
By Byram Wayne Bridle & Shayan Sharif
Where do COVID-19 vaccine players stand on pricing? So far, it's no profit, slight profit or undecided
By Eric Sagonowsky
New data offer glimpse of efficacy of Oxford-AstraZeneca Covid-19 vaccine
By Helen Branswell, Matthew Herper & Damian Garde
A COVID-19 Vaccine Reality Check
By Sarah Zhang