Additionally, the levels of chemokines such as C-X-C motif chemokine ligand 10 (CXCL10) and chemokine (C-C motif) ligand 18 (CCL18) were elevated in the plasma and serum of post-COVID patients with pulmonary fibrosis, suggesting their involvement in chronic inflammation and fibrotic remodeling [50,56]. Here, CCL18 is linked to pulmonary fibrosis.