Elisabeth Mahase. (2021, July 26). At least 6 weeks between Pfizer vaccine doses = higher neutralising antibody levels (than a 3-4 wk interval) For those with the delta variant, antibody levels were 2.3-fold higher with the longer interval Preprint from @pitchstudy @bmjlatest https://t.co/E3yOTqNgpa [Tweet]. @emahase. https://twitter.com/emahase_/status/1419604658344112130