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New study in Nature finds no such thing as natural immunity to covid after the arrival of omicron. Pre-omicron, infection provided 80% protection against re-infection one year later. This falls to under 5% at one year with omicron

Two distinct patterns in the protective effect of natural infection against reinfection in the Omicron variant versus pre-Omicron eras show that SARS-CoV-2 immune protection is shaped by dynamic interaction between host immunity and viral evolution.

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