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Oxford University Press - PMC COVID-19 Collection logoLink to Oxford University Press - PMC COVID-19 Collection
. 2022 Jan 3:ciab1072. doi: 10.1093/cid/ciab1072

Two cases of breakthrough SARS-CoV-2 infections caused by the Omicron variant (B.1.1.529 lineage) in international travelers to Japan

Taketomo Maruki 1, Noriko Iwamoto 1,, Kohei Kanda 1, Nobumasa Okumura 1, Gen Yamada 1, Masahiro Ishikane 1, Mugen Ujiie 1, Masumichi Saito 2, Tsuguto Fujimoto 2, Tsutomu Kageyama 2, Tomoya Saito 2, Shinji Saito 2, Tadaki Suzuki 2, Norio Ohmagari 1
PMCID: PMC8755371  PMID: 34979547

Abstract

In November 2021, the World Health Organization designated a new SARS-CoV-2 variant of concern, Omicron (PANGO lineage B.1.1.529). We report on first two cases of breakthrough COVID-19 caused by Omicron in Japan among international travelers returning from the country with undetected infection. The spread of infection by Omicron were considered.

Keywords: COVID-19, SARS-CoV-2, Omicron, variant of concern, spike mutation

Supplementary Material

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Supplementary Materials

ciab1072_suppl_Supplementary_Figure_Legend
ciab1072_suppl_Supplementary_Figure_S1
ciab1072_suppl_Supplementary_Table_S1

Articles from Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America are provided here courtesy of Oxford University Press

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