Using different shots for the first and second doses might give better protection, say experts.
Covid: People 45 or over in England invited to book vaccine
It comes after all over-50s and those in high-risk groups in the UK have been offered a first dose.
Covid-19: England gets third jab as Moderna rollout begins
It offers an alternative to the AstraZeneca jab for under-30s, after very rare blood clot concerns.
Johnson & Johnson vaccine paused over rare blood clots
Following rare blood clots, the US, South Africa and EU have suspended the jab.
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