Post COVID-19 condition after SARS-CoV-2 infections during the omicron surge compared with the delta, alpha, and wild-type periods in Stockholm, Sweden


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Little is known about the post–COVID-19 condition (PCC) after infections with different SARS-CoV-2 variants. We investigated the risk of PCC diagnosis after primary omicron infections as compared with preceding variants in population-based cohorts in Stockholm, Sweden. When compared with omicron (n = 215 279, 0.2% receiving a PCC diagnosis), the adjusted hazard ratio (95% CI) was 3.26 (2.80–3.80) for delta (n = 52 182, 0.5% PCC diagnosis), 5.33 (4.73–5.99) for alpha (n = 97 978, 1.0% PCC diagnosis), and 6.31 (5.64–7.06) for the wild type (n = 107 920, 1.3% PCC diagnosis). These findings were consistent across all subgroup analyses except among those treated in the intensive care unit.



Pontus Hedberg, Pontus Nauclér, Post–COVID-19 Condition After SARS-CoV-2 Infections During the Omicron Surge vs the Delta, Alpha, and Wild Type Periods in Stockholm, Sweden, The Journal of Infectious Diseases, Volume 229, Issue 1, 15 January 2024, Pages 133–136,