The CDC previously had rejected the idea that natural immunity was effective against Covid, despite flying in the face of a substantial body of research indicating that it did. However, a recent CDC study reviewed data from New York and California from May to November 2021. It was found that by the first week of October 2021, Covid-19 rates among the vaccinated who did not experience any previous infection were 6.2 and 4.5 times lower in California and New York than among the unvaccinated with no previous infection, but the unvaccinated but had experienced a prior Covid-19 infection, the case rate was 29 times lower in California and 14.7 times lower in New York. It was concluded that previous infection with Covid offered natural immunity and protection.
https://www.naturalnews.com/2022-01-21-study-natural-immunity-better-than-vaccine-immunity.html