UK study of Delta (Indian) variant. Very informative though “early days”.
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/991343/Variants_of_Concern_VOC_Technical_Briefing_14.pdf
https://twitter.com/profshanecrotty/status/1408186182693883904 Lot about “wild” and vaccine-induced immunity. Encouraging.