'Natural Immunity' Holds Up Against Severe Omicron Cases in Qatar Study

'Natural Immunity' Holds Up Against Severe Omicron Cases in Qatar Study 'Robust' protection from previous infection against hospitalization, death by reinfection Molly Walker medpagetoday

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However, no reinfections resulted in death, and the effectiveness of natural infection against "severe, critical or fatal" COVID from the Omicron variant was 87.8% (95% CI 47.5-97.1), they wrote in a correspondence in the New England Journal of Medicine...