Thanks to Marianna and DW. This would have been a better answer to the question I messed up:

Two-dose Pfizer-BioNTech vaccination provides some protection against symptomatic infection with omicron, but significant protection against hospitalisation (South Africa data)

33% protection against infection with omicron, relative to the unvaccinated

(down from 80% protection against infection with delta)

70% protection against hospital admission in omicron infection, relative to the unvaccinated

(down from 93% protection with delta)

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