The COVID-19 pandemic

[tomh009]

UK study confirms that vaccination reduces the transmission of SARS-CoV-2 (the virus that causes COVID-19):
https://www.medrxiv.org/content/10.1101/...21264260v1

Simplified summary:

Two doses of BNT162b2 (BioNTech-Pfizer) or ChAdOx1 (AstraZeneca) vaccines in Alpha variant index cases independently reduced PCR-positivity in contacts (aOR, adjusted odds ratio vs. unvaccinated=0.18 and 0.37 respectively).

The Delta variant attenuated vaccine-associated reductions in transmission: two BNT162b2 (BioNTech-Pfizer) doses reduced Delta transmission (aOR=0.35, more than ChAdOx1 (aOR=0.64).

So, most impact on Alpha, less so on Delta (no data on mixed doses). And, yes, the reduction does taper off over time. But, again, yet another reason to get vaccinated.