Pfizer: We don’t know if COVID-19 vaccine defends without second shot
"There is no data to demonstrate that protection after the first dose is sustained after 21 days," BioNTech and partner Pfizer said in a Monday press release.
A participant takes part in a simulation for medical personnel at Sheba Medical Center for the Pfizer coronavirus vaccine.(photo credit: Courtesy)ByJERUSALEM POST STAFF
