Global Health & Medicine 2022;4(2):133-136.

The first eleven cases of SARS-CoV-2 Omicron variant infection in Japan: A focus on viral dynamics

Okumura N, Tsuzuki S, Saito S, Saito T, Takasago S, Hojo M, Iwamoto N, Ohmagari N


The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant has spread rapidly worldwide. We report the clinical characteristics and threshold cycle (Ct) values of the first 11 patients infected with the SARS-CoV-2 Omicron variant in Japan. All patients were younger returnees from abroad; 10 patients had received two doses of vaccine. Estimated Ct values for the 11 patients were 6.0 (95% confidence interval [CI] 4.2-7.3) days for > 30, 10.6 (95% CI 9.5-11.9) days for > 35, 15.1 (95% CI 13.6-17.6) days for > 40, and 19.7 (95% CI 17.3- 23.7) days for > 45. Our results provide important insights for indicators of infection control.

KEYWORDS: COVID-19, B.1.1.529, threshold cycle, characteristics

DOI: 10.35772/ghm.2021.01124

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