Duration of Infectious Virus Shedding by SARS-CoV-2 Omicron Variant-Infected Vaccinees

Emerg Infect Dis. 2022 May;28(5):998-1001. doi: 10.3201/eid2805.220197. Epub 2022 Mar 15.


To determine virus shedding duration, we examined clinical samples collected from the upper respiratory tracts of persons infected with severe acute respiratory syndrome coronavirus 2 Omicron variant in Japan during November 29-December 18, 2021. Vaccinees with mild or asymptomatic infection shed infectious virus 6-9 days after onset or diagnosis, even after symptom resolution.

Keywords: 2019 novel coronavirus disease; COVID-19; Japan; Omicron; SARS-CoV-2; coronavirus disease; respiratory infections; severe acute respiratory syndrome coronavirus 2; vaccines; variant of concern; viral shedding; viruses; zoonoses.

MeSH terms

  • Asymptomatic Infections
  • COVID-19*
  • Communicable Diseases*
  • Humans
  • SARS-CoV-2
  • Virus Shedding

Supplementary concepts

  • SARS-CoV-2 variants