: Pfizer, citing Israeli data that says the delta variant is making its COVID-19 shot less effective, calls for boosters. Medical experts say it’s too soon to worry.

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Israel said the delta variant is blunting the effectiveness of BioNTech and Pfizer’s COVID-19 shot, but how well a vaccine works is going to fluctuate in the real world and a single data point may not tell the whole story.

Israel said the delta variant is blunting the effectiveness of BioNTech and Pfizer’s COVID-19 shot, but how well a vaccine works is going to fluctuate in the real world and a single data point may not tell the whole story.