England health officials defend contingency plan to mix Covid vaccines

PHE says it is reasonable to mix the two approved vaccines in exceptional circumstances

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Officials have defended England's vaccine regimen after details of a contingency plan to mix the two approved jabs in a small number of cases emerged.

Public Health England's Covid green book" recommends that it is reasonable to offer one dose of the locally available product to complete the schedule" if the same vaccine used for the first dose is not available. But it adds: There is no evidence on the interchangeability of the Covid-19 vaccines although studies are under way."