Actually, there is. The new-daily-cases-per-capita rate for unvaccinated people is at least 6x the rate of vaccinated people, per the most recent data in this NYT analysis [0]. And the reduction was observed for Pfizer, Moderna, and J&J vaccines.

[0] Who Had Covid-19 Vaccine Breakthrough Cases? https://nyti.ms/3nFvITV

That's the US data which is hopelessly corrupted by politics; the CDC simply hasn't been reporting honest statistics about vaccines from the start.

In the UK where the health authorities break down by age and vaxx status with what seems to be reasonably accurate reporting, the vaccinated per capita rate is ~2x the unvaccinated rate and nobody knows why.

This is incorrect: we don't know the rates, because we don't know the denominators. Published figures use estimated denominators: "because the proportion of unvaccinated people is small and the NIMS population estimates are high, it makes the unvaccinated population appear significantly larger than it is. As a consequence, the Covid case rate per 100,000 unvaccinated people, when calculated using this figure, is suppressed. Just being out by 1 or 2 per cent could change the apparent population of unvaccinated people by 30 per cent." (from https://www.thetimes.co.uk/article/cfaadc98-35ab-11ec-8ef4-8... )

The quote from parent was about transmission.

As every new case is a result of transmission, a difference in the per-capita rate of new cases between vaccinated and unvaccinated people shows an identical difference in the rate of transmission.

Personal attacks are not allowed here, regardless of how wrong someone else is or you feel they are. If you wouldn't mind reviewing https://news.ycombinator.com/newsguidelines.html and taking the intended spirit of the site more to heart, we'd be grateful.

>Immediately before that: The Pfizer BioNTech vaccine against COVID-19 has an efficacy of 95% against symptomatic SARS-CoV-2 infection.

I'm not sure how that contradicts the parent post? You could be protected from hospitalization/symptoms, but still be transmitting it.

Argumentum ad hominem usually implies an irrational opinion or manipulative rhetoric.