Dr Julian Tang, a clinical virologist at the University of Leicester, said: "Despite the earlier misgivings about the way this Russian Sputnik V
vaccine was rolled out more widely - ahead of sufficient Phase 3 trial data - this approach has been justified to some extent now.
"Such pandemic-related vaccine rollout compromises have, to be fair, been adopted in the UK vaccination programme also - with the extended intervals
between the first and second doses.
"So we should be more careful about being overly critical about other countries' vaccine designs."
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