Global Health & Medicine
Online ISSN : 2434-9194
Print ISSN : 2434-9186
The first eleven cases of SARS-CoV-2 Omicron variant infection in Japan: A focus on viral dynamics
Nobumasa OkumuraShinya TsuzukiSho SaitoTomoya SaitoSatoshi TakasagoMasayuki HojoNoriko IwamotoNorio Ohmagari
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2022 Volume 4 Issue 2 Pages 133-136


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.

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© 2022 National Center for Global Health and Medicine
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