be common place. Again, 98% of ICU patients are "Unvaccinated"...thank your lucky stars for the mRNA vaccines that can be 're-formulated in record time, if necessary (i.e. viruses continue to mutate...it's just what they are).
Link: https://www.cdc.gov/coronavirus/2019-ncov/variants/delta-variant.html?s_cid=11504:vaccine%20effectiveness%20delta%20variant:sem.ga:p:RG:GM:gen:PTN:FY21