Two Cases of Breakthrough Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infections Caused by the Omicron Variant (B.1.1.529 Lineage) in International Travelers to Japan
Taketomo Maruki, Noriko Iwamoto, Kohei Kanda, Nobumasa Okumura, Gen Yamada, Masahiro Ishikane, Mugen Ujiie, Masumichi Saito, Tsuguto Fujimoto, Tsutomu Kageyama, Tomoya Saito, Shinji Saito, Tadaki Suzuki, Norio Ohmagari
Abstract
In November 2021, the World Health Organization designated a new severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant of concern, Omicron (PANGO lineage B.1.1.529). We report on the first 2 cases of breakthrough coronavirus disease 2019 (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.
Topics & Concepts
Lineage (genetic)Coronavirus disease 2019 (COVID-19)Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)CoronavirusMedicine2019-20 coronavirus outbreakVirologyDiseaseBetacoronavirusInfectious disease (medical specialty)GenePathologyBiologyGeneticsOutbreakSARS-CoV-2 and COVID-19 ResearchCOVID-19 Clinical Research StudiesSARS-CoV-2 detection and testing