ACE2 and TMPRSS2 co-expression was detected in five out of eight kidney cell types (collecting duct cells, Henle’s loop cells, mesangial cells, podocytes, and T cells), one out of six heart cell types (endothelial cells) (Fig. 2f, h and Supplementary Data 2), and six out of nine lung cell types (AT1 cells, AT2 cells, ciliated cells, endothelial cells, fibroblasts, and secretory cells) (Fig. 3b, e, f), thus indicating infection potential of the lung, kidney, and heart. The gene discussed is ACE2; the disease is infection.