The company revealed new, encouraging data showing the vaccine may do a better-than-expected job at protecting patients against new variants.
Widely Used COVID-19 Vaccine May Be More Effective if Second Dose Is Given After a Long Wait Rather Than a Short One
Single-dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials.
Vaccine supply expected to surge soon
The U.S. supply of coronavirus vaccines is expected to significantly expand over the next few months, with more than enough doses available to vaccinate all U.S. adults before the end of July.
Vaccine chaos may undermine second doses
Some of the same problems that have plagued the coronavirus vaccine rollout could also make it harder for people to get the second dose of the vaccines.