Trials are currently underway to assess the most effective way to immunise the most vulnerable age brackets.
According to government sources, cited by The Times, two trials are underway and are being supervised by chief medical officer Chris Whitty.
The first trial – taking place in Porton Down, Wiltshire – is reportedly utilising vaccines specifically modified to tackle new Covid variants.
Meanwhile, the second trial involves participants who are given a third Covid jab (that is already in use).
Covid jabs already in use:
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