Pfizer says COVID-19 vaccine booster dose effective, safe
https://healthell.blogspot.com/2021/08/pfizer-says-covid-19-vaccine-booster.html
Pfizer says COVID-19 vaccine booster dose effective, safe
Pfizer and BioNTech said a booster or third dose of its COVID-19 vaccine is safe and elicits an antibody response at levels that “significantly exceed” those seen in individuals who receive two doses of the jab.
