'Natural immunity' from omicron is weak and limited
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In unvaccinated people, infection with the Omicron variant of SARS-CoV-2 provides little long-term immunity against other variants. In experiments using mice and blood samples from donors who were infected with Omicron, the team found that the Omicron variant induces only a weak immune response. In vaccinated individuals, this response—while weak—helped strengthen overall protection against a variety of COVID-19 strains. In those without prior vaccination, however, the immune response failed to confer broad, robust protection against other strains.

As the Omicron variant of SARS-CoV-2 spread around the globe in late 2021 and early 2022, anecdotal evidence quickly mounted that it was causing less severe symptoms than Delta and other variants of concern. However, scientists weren’t initially sure why that was, or how a weaker infection might impact long-term immunity against COVID-19.

Source: https://www.nature.com/articles/s41586-022-04865-0
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