If supplies become an issue then there is a risk the timetable of vaccinations slips. The 2nd dose cannot be delayed. Once you have first dose, clock is ticking.
If people do not receive their second dose in the 12-week time frame we don't know what the consequences will be in terms of mutations and virus escape. The government will lose the credibility it has gained with the public, so it's vital for public health and trust.
Latest scientific data suggests that the oxford vaccine 2nd dose can be delayed 12 weeks and still be effective, this will be fine if all the others have the same results
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