Against which variant? Context matters.
Edit: Checked myself but the variation in efficacy reported has me question the results. Is it x or y, being between x and y leads me to conclude.they really don't know the true impact.
I again go back to, how do we know how that individual would have responded to the illness with and without the vaccine? We won't ever know that answer so I take these statements with a grain of salt.
- Coronavirus infections caused by the Delta variant, which has surged since July, now make up more than 99 percent of all new coronavirus infections in the United States.
- There’s been an increase in hospitalizations in recent months. The majority involve unvaccinated people.
- Although vaccine effectiveness has waned slightly against infection with Delta, data so far suggests the Moderna vaccine is approximately 50 to 95 percent effective against Delta, and the Pfizer-BioNTech vaccine is 39 to 96 percent effective against Delta.
- Even though vaccines offer different ranges of protection, real-world evaluations show they still provide robust protection against hospitalization at 60 to 95 percent
https://www.healthline.com/health-news/heres-how-well-covid-19-vaccines-work-against-the-delta-variant