claim: functional myeloid-derived suppressor cells expand in blood but not airways of covid-19 patients and predict disease severity
evidence_1: in conclusion, m-mdscs expand in blood of covid-19 patients, suppress t cells and strongly associate with disease severity, suggesting a role for m-mdscs in the dysregulated covid-19 immune response.", "m-mdscs isolated from covid-19 patients suppressed t cell proliferation and ifnγ production partly via an arginase-1 (arg-1) dependent mechanism.")