World Citing the Delta Variant, Pfizer Will Pursue Booster Shots and a New Vaccine July 8, 2021July 8, 2021APOORVA MANDAVILLIComments Off on Citing the Delta Variant, Pfizer Will Pursue Booster Shots and a New Vaccine Scientists were critical of the announcement, pointing to evidence that the current two-dose regimen is powerfully effective against the coronavirus.
