Covid-19 roundup: Study finds that mix­ing Covid-19 vac­cines could lead to more fre­quent side ef­fects; CDC ad­comm votes unan­i­mous­ly in fa­vor of Pfiz­er/BioN­Tech shot in ado­les­cents

Fol­low­ing re­ports of blood clots with low platelets, coun­tries like Den­mark are rec­om­mend­ing that those who got their first As­traZeneca shot should re­ceive a dif­fer­ent vac­cine for their sec­ond dose. But a study led by Ox­ford Uni­ver­si­ty now sug­gests that mix­ing and match­ing vac­cines could lead to more fre­quent side ef­fects.

The study, dubbed Com-COV, en­rolled 830 par­tic­i­pants who re­ceived ei­ther two dos­es of the Pfiz­er/BioN­Tech vac­cine, two dos­es of the As­traZeneca jab, or a com­bi­na­tion of both. The vac­cines were giv­en at one of two in­ter­vals (28 or 84 days apart).

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