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“Effectiveness of primary infection against severe, critical or fatal COVID-19 reinfection was 97.3 percent, irrespective of the variant of primary infection or reinfection, and with no evidence of waning. Similar results were found in sub-group analyses for those less than 50 years of age,” they wrote.

“Despite waning protection against reinfection, strikingly, there was no evidence for the waning of protection against severe COVID-19 at reinfection. This remained at around 100 percent, even 14 months after the primary infection, with no appreciable effect for omicron immune evasion in reducing it.”

Before the emergence of omicron in late November 2021, natural immunity against COVID-19 dropped to only 70 percent after 16 months – which the study authors attributed to a “genuine waning in biological immunity.”

While much more infectious than earlier strains, omicron caused milder symptoms in infected individuals. The BA4 and BA5 sub-variants of omicron are now the most dominant strain of SARS-CoV-2.

“Vaccine immunity may last for only a year, but natural immunity may last for three years,” the study authors stated.

https://www.brighteon.com/0542....43c9-ea40-4c2e-b675-

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