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FDAの最新の見解だと、デルタに効きにくいというよりも時間経過による有効性の減退で説明できそうな感じだと

In its briefing docs for Friday’s FDA booster mtg, Pfizer lays out the case for boosting at 6-8 months, citing data from Israel & US. Notes the erosion is likely due more to waning effectiveness than Delta escape