Baroness Hayman Portrait Baroness Hayman (CB) [V]
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My Lords, a descent into a tit-for-tat vaccine war would obviously be disastrous, given the global nature of both vaccine supply chains and the pandemic itself. Given the worrying developments that we have seen in this area, what research has been done and consideration given to the possibility of mixing and matching second doses with a different vaccine—something which was talked about originally and might become necessary in the light of particular difficulties in supply chains?

Lord Bethell Portrait Lord Bethell (Con)
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My Lords, I completely agree with the noble Baroness that a descent into some type of vaccine war would be extremely regrettable, and the British Government are doing everything they can to continue in a spirit of partnership with overseas Governments. We have not reached the possibility of taking on a mixing and matching approach. We believe that the supply chain we have in place is ample to achieve the targets we have already published. However, to answer her question directly, there is some evidence that mixing and matching may prove to be even better than having two of the same vaccine—that it may stimulate the immune system in ways that give you a more developed response to the virus. Therefore, we continue to look carefully at this possibility.