Thread by @DrEricDing

📍The good news is vaccines work—lower mortality of an 80-year-old down to ➡️unvaxxed 50-year-old; a vaxxed 50 -year-old➡️unvaxxed 30-year-old. This has prevented scores of deaths & hospitalizations.📍But the bad news—vaccines vs #DeltaVariant are leaky.🧵
ft.com/content/0f11b2…

2) “Leaky vaccines probably put herd immunity out of reach, especially when faced with [the] Delta [#DeltaVariant],” Kit Yates said.

3) “some now think that imperfect protection offered by the vaccine against infection meant herd immunity could be “impossible” without vaccine uptake of above 90%—of all people including kids, not just of the eligible. google.com/amp/s/amp.ft.c…

4) PHE estimates that on average the Covid-19 vaccines being used in the UK are between 91-97% effective in preventing hospital admission.
Kucharski warned that small differences could have a big effect on how much this wave of infections stretches 🇬🇧 healthcare system…

5) “If you flip the number, you’re left with how ineffective the vaccines are and 9% ineffective rather than 3 per cent ineffective means 3 times more hospitalisations” (versus the #DeltaVariant)

==>however Singapore MOH data suggest 4.9x more hospitalization/death with Delta.