ワクチン3回目の接種は4か月で効力がなくなり、4回目が必要かも

集団免疫は幻想だったのか、4か月ごとにワクチン接種はつらい。

2/12NYT；C.D.C. Data Shows Boosters’ Protection Plunges After 4 Months

Covid boosters lose much of their potency after four months, raising the possibility that some Americans may need a fourth dose, the agency said.