“Doom and gloom” Delta study- to counter my possibly pollyanna-ish inclination:
https://www.researchsquare.com/article/rs-637724/v1
” Indeed in vitro, the delta variant is less sensitive to neutralising antibodies in sera from recovered individuals, with higher replication efficiency as compared to the Alpha variant...
“the Delta variant not only dominates vaccine-breakthrough infections with higher respiratory viral loads compared to non-delta infections (Ct value of 16.5 versus 19), but also generates greater transmission between HCW as compared to B.1.1.7...”
A couple of bright spots from the study you linked:
Serum neutralising titres against the SARS-CoV-2 Delta variant were significantly lower in participants vaccinated with ChadOx-1 (AstraZeneca) as compared to BNT162b2 (Pfizer/BioNTech(GMT 3372 versus 654, p<0001).”
Looks like Pfizer packs five times the punch of AZ against Delta, in terms of circulating antibodies. That is probably why the UK is pushing Pfizer shots now, for its population, as well as speeding up second shots.
“severe disease in fully vaccinated HCW (Health Care Workers) was rare”