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As the delta variant sweeps the world, researchers are tracking how well vaccines protect against it — 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%.

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