As the delta variant sweeps the world, researchers are tracking how well vaccines protect against it ¡ª and getting different answers.
In the U.K., researchers reported in May that two doses of the Pfizer-BioNTech vaccine had an effectiveness of 88% protecting against symptomatic disease from delta. A June study from Scotland concluded the vaccine was 79% effective against the variant, and on Saturday a team of researchers in Canada pegged its effectiveness at 87%.
On Monday, though, Israel¡¯s Ministry of Health announced that the effectiveness of the Pfizer-BioNTech vaccine was seen to be 64% against all coronavirus infections ¡ª down from about 95% in May, before the delta variant began its climb to near-total dominance in Israel.
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