APOD and COVID-19: CRTAC1, APOD, CFD, AGT, S100A8, RNASE1, SAA2, MRC1, TNC, DEFA1 , LYZ, B2M, DAG1, FETUB, APOA2, and LCN2 have all been identified as associated with COVID-19 in other research [36–44], but the remaining proteins appear to be novel to our research.