Across the EU nearly 50% of adults have had at least one jab, which you'd hope would provide the most vulnerable with a degree of protection, especially with case numbers generally so low at the moment. Interestingly, on the European Disease Control vaccine site, they cite a target of 70% for the vaccinations, which obviously the UK passed a while ago (for first doses). Is that figure for some form of "herd immunity"?You’d hope so given that vaccines appear to halve transmission rates.
In addition to the direct effects of preventing cases and reducing severity, we have shown that both the ChAdOx1 nCoV-19 and BNT162b2 vaccines are associated with reduced likelihood of household transmission by 40-50% from individuals diagnosed with COVID-19 after vaccination, highlighting important wider benefits to close contacts. While this analysis was primarily intended to understand impacts on transmission to household contacts rather than those outside the household, the former are consistently identified as being at high risk for secondary infection.