Omicron's grip on Sweden: High transmission rates persist despite high seroprevalence SARSCoV2 Omicron infection Sweden seroprevalence COVID19 pandemic publichealth surveillance vaccination CDC_NCEZID
By Dr. Sanchari Sinha Dutta, Ph.D.May 7 2023 A Swedish study published in the journal Emerging Infectious Diseases observes a high prevalence of severe acute respiratory syndrome coronavirus 2 omicron infection despite more than 80% seroprevalence in Sweden.
The most recently emerged omicron variant of SARS-CoV-2 has shown significantly higher transmissibility and infectivity compared to other variants of concern with improved viral fitness that have emerged during the pandemic. In the current study, scientists have conducted two cross-sectional surveys during 2022 to estimate COVID-19 point-prevalence and overall seroprevalence in Sweden.
Important observations The point prevalence of COVID-19 in the Swedish population was estimated to be 1.4% at the end of March. All detected infections were caused by omicron subvariants except one that was caused by delta variant. In the September survey, the point prevalence was estimated to be 1.5%. All detected infections were caused by omicron subvariants.
Regarding symptoms, about 65% and 67% of the participants from the March and September surveys, respectively, reported more than one symptom within two weeks before sampling.
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