Covid-19 roundup: Sci­en­tists in­ves­ti­gate po­ten­tial safe­ty changes to J&J and As­traZeneca vac­cines; WTO lists crit­i­cal in­puts for vac­cine man­u­fac­tur­ing

Sci­en­tists from J&J, As­traZeneca and the Uni­ver­si­ty of Ox­ford are in­ves­ti­gat­ing po­ten­tial mod­i­fi­ca­tions to their Covid-19 vac­cines, to see if it’s pos­si­ble to re­duce or …

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