The new variant popularly called "Delta" (officially B.1.617.2, first noted in India) is now >90% of the cases tested in UK. Here's gouge on vaccine effectiveness from Public Health Scotland and Public Health England.   Conclusion:  After 2 doses of either vaccine there were only modest differences in vaccine effectiveness with the B.1.617.2 variant. Absolute differences in vaccine effectiveness were more marked with dose 1. This would support maximising vaccine uptake with two
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