B1617 is a problem. We luckily have vaccines now (unlike 6 months ago)- but they're only useful if jabs get into arms & people are fully vaccinated. So we shouldn't unlock faster than we can ensure people are fully protected. Including people 30-50. https://t.co/etERpkH5lW

— Prof. Devi Sridhar (@devisridhar) May 14, 2021