Vaccine effectiveness against symptomatic cases with the Delta variant is estimated to be 88% after both doses of the Pfizer/BioNTech vaccine and 67% after both doses of the Oxford/AstraZeneca vaccine."
Source:
https://www.ons.gov.uk/peoplepopulationandcommunity/healthan...
The vaccine still appears to be highly effective, 93%, at preventing serious illness and hospitalization, the data shows, though this is also slightly lower than earlier studies suggested and for other variants."
Source: https://www.forbes.com/sites/roberthart/2021/07/06/pfizer-sh...
Given that my daughter, who got the Pfizer vaccine, is unlikely to be exposed to covid-19 virus MORE often than a typical healthcare worker, this is good news. I wish we had as good a study for Moderna and J&J, but hopefully we get one soon.
I'm also very happy that studies like this are being done. We need a whole lot more studies looking at this, long term immunity with B and T-cells, and comparing neutralizing antibody levels between vaccinated and unvaccinated who have been infected but show little or no symptoms.
That's why it's essential to work towards having the whole world vaccinated, and to understand that weakening so we can do boosters where appropriate.
Vaccinated people can get the delta variant (though with a lower probability of infection) but are often asymptomatic or have a very mild case. The vaccine is highly effective (>95%) at preventing severe COVID even if infection occurs. Unfortunately the vaccinated can spread delta even if they have no or mild symptoms.
In Ohio vaccination rates are high in the cities and low in rural areas, which unfortunately are also the areas under-served by hospitals.
TL;DR the Pfizer vaccine works, essentially 100% of the time as far as severe cases go, more than 99% never getting it at all. I'm glad they're doing the rest of this research, but this part is what I personally am most concerned with.