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The highly transmissible Delta variant of coronavirus has rendered the prospect of herd immunity, where the majority of a country's population becomes immune to a virus, difficult, the head of the UK's Oxford Vaccine Group has warned.

United kingdomAndrew pollardPaul hunterSajid javidUnited kingdom healthUniversity of east angliaParty parliamentary groupUnited kingdom oxford vaccine groupOxford universityHerd immunity notPossibility with delta variantWarns united kingdom vaccine expertOxford vaccine groupAll party parliamentary groupCoronavirus tuesdayEast anglia