Mass cytometry reveals a conserved immune trajectory of recovery in hospitalized COVID-19 patients

The UCSF COMET Consortium

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


While studies have elucidated many pathophysiological elements of COVID-19, little is known about immunological changes during COVID-19 resolution. We analyzed immune cells and phosphorylated signaling states at single-cell resolution from longitudinal blood samples of patients hospitalized with COVID-19, pneumonia and/or sepsis, and healthy individuals by mass cytometry. COVID-19 patients showed distinct immune compositions and an early, coordinated, and elevated immune cell signaling profile associated with early hospital discharge. Intra-patient longitudinal analysis revealed changes in myeloid and T cell frequencies and a reduction in immune cell signaling across cell types that accompanied disease resolution and discharge. These changes, together with increases in regulatory T cells and reduced signaling in basophils, also accompanied recovery from respiratory failure and were associated with better outcomes at time of admission. Therefore, although patients have heterogeneous immunological baselines and highly variable disease courses, a core immunological trajectory exists that defines recovery from severe SARS-CoV-2 infection.

Original languageEnglish
Pages (from-to)1284-1298.e3
Issue number7
StatePublished - Jul 12 2022


  • COVID-19
  • disease resolution
  • immune cell signaling
  • immune response
  • recovery


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