@LongCovidPharmD Ah, thanks for pointing that out.
I want to know how Omicron variants have affected people who already had #mecfs. This is to inform the current risk of getting infected (we have been shielding for three years and it is getting tiresome). I'm not concerned with if they were vaccinated or not (at this granularity - if I were doing a more detailed survey I would try to tease that out), but I assume a fair proportion would have been by the time Omicron came on the scene. Post-vax worsening of #mecfs is a separate question!
The only survey results on this question I can find are from early 2021 and that is from the Alpha/Delta pre-vax era, which arguably is not of much use to determine current risks.