Albert Bourla, Pfizer CEO (Gian Ehrenzeller/Keystone via AP Images)

Covid-19 roundup: US ne­go­ti­at­ing for more dos­es of Pfiz­er vac­cine; Brazil de­lays ef­fi­ca­cy read­out for Sino­vac vac­cine

Af­ter al­leged­ly pass­ing up an of­fer to ac­quire more dos­es of Pfiz­er and BioN­Tech’s Covid-19 vac­cine last month, the US gov­ern­ment is in ne­go­ti­a­tions to …

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