Full Coverage
The FDA's cutoff for Covid-19 vaccine effectiveness is 50 percent. What does that mean?
By Jacqueline Stenson
AstraZeneca Expects Covid-19 Vaccine Trial Results This Year
By Jenny Strasburg
COVID-19 tracker: Pfizer, Moderna vaccines sharply cut hospitalizations in older adults, CDC data show
By Fraiser Kansteiner, Eric Sagonowsky & Noah Higgins-Dunn
AstraZeneca says COVID-19 vaccine could arrive in January of next year
By Khristopher J. Brooks