US study suggests efficacy of 1st Pfizer, Moderna shot increases with time https://t.co/ze99BojNt7 via @timesofisrael 0 atbildes

	KM (2021-02-21 11:08:48) @twitter	US study suggests efficacy of 1st Pfizer, Moderna shot increases with time https://t.co/ze99BojNt7 via @timesofisrael