IL6 and severe acute respiratory syndrome: In parallel, systemic inflammation and cytokine storms with elevated plasma levels of the CXCL family, G-CSF, GMCSF, IL-1β, IL-8, and IL-6 are reported among SARS patients, which are most likely produced by airway epithelial cells as well as a variety of immune cells such as neutrophils, macrophages, lymphocytes, and NK cells [61,64,65,66].