CXCL10 and COVID-19: In detail, increasing levels of pro-inflammatory cytokines have been observed, such as interleukin 6 (IL-6), described as an independent prognostic factor for COVID-19 mortality [36], interleukin 8 (IL-8), interferon-gamma (IFN-γ)-induced protein 10 kDa (IP-10), or C–X–C motif chemokine 10 (CXCL10); and lower levels of IFN- γ [37].