Increased production of inflammatory cytokines and myeloid-derived suppressor cells occurs in patients with coronavirus disease 2019. These inversely correlated with perforin-expressing natural killer (NK) and CD3+ T cells. We observed a lower number of perforin-expressing NK cells in intensive care unit (ICU) patients compared with non-ICU patients, suggesting an impairment of the immune cytotoxic arm as a pathogenic mechanism.
Bordoni, V., Sacchi, A., Cimini, E., Notari, S., Grassi, G., Tartaglia, E., et al. (2020). An inflammatory profile correlates with decreased frequency of cytotoxic cells in coronavirus disease 2019. CLINICAL INFECTIOUS DISEASES, 71(16), 2272-2275 [10.1093/cid/ciaa577].