10-04-2021, 10:28 PM
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:
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.
https://www.medrxiv.org/content/10.1101/...21264260v1
Simplified summary:
Quote: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.

