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Scientists test the risks and rewards of mixing Covid shots

Oxford scientists are expanding efforts to test whether two different Covid-19 vaccines can be combined after some European countries worried by rare side effects with the Oxford/AstraZeneca jab started offering other vaccines as second shots. 

For the second stage of its continuing trial, the Oxford Vaccine Group is recruiting more than a thousand participants who have already received an AstraZeneca or BioNTech/Pfizer shot.