Comprehensive research: Pfizer vaccines less effective against Delta variant | Israel today
2021-07-22T07:38:58.568Z
The New England Journal of Medicine published a study on the efficacy of vaccines against various corona strains • Against the Delta variant, Pfizer efficacy drops to 88%, whereas in the case of Astraznica - enjoys only 67% protection • Researchers: " The results illustrate the need for two doses of vaccine "