Current mRNA vaccines are highly effective at preventing severe disease and death of all widely circulating variants, including omicron
Varies by # of months since last dose, https://www.youtube.com/watch?v=TSZMtSPX3iE
Dec 20, https://www.euronews.com/next/2021/12/20/omicron-3-vaccine-d...
> COVID-19 vaccines will not be enough to withstand the Omicron variant, warned the CEO of BioNTech, the German company behind the mRNA vaccine produced with Pfizer. "We must be aware that even triple-vaccinated are likely to transmit the disease…It is obvious we are far from 95 per cent effectiveness that we obtained against the initial virus."
> What can prevent it?
Thus my answer.