IFNG and COVID-19: When adjusted by the co-founding factors, the odds ratios expressing the risk of having lung fibrosis in COVID-19 were significant for baseline IFN-γ and MCP-3, with estimates of 0.41 (95% CI, 0.20–0.86, p = 0.02) and 0.25 (95% CI, 0.07–0.83, p = 0.02), respectively (Table 3).