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Re:Moderna Vaccine Significantly More Effective Against Delt... by hbrav on Wednesday August 11, 2021 @08:22PM (#28150021)
Some Canadian provinces treated mRNA vaccines as interchangeable. In Ontario a lot of people got a first dose of Pfizer and a second of Moderna.

There's currently a study underway in the UK (I forget the name, but it run by the University of Oxford) to assess the efficacy of mixed-dose vaccination.

Re:Moderna Vaccine Significantly More Effective Against Delt... by gpm on Wednesday August 11, 2021 @08:45PM (#28150239)
More than mRNA vaccines as interchangeable, we (Ontario) mostly treated the oxford vaccine as interchangeable with the mRNA vaccines too, until we started giving it to less people.