Interestingly, we found that TMPRSS2 expression levels were well associated with the SARS‐CoV‐2 genome copy numbers in human intestinal epithelial cells (Figs 2C and EV4) which is consistent with the observation that TMPRSS2 and the related protease TMPRSS4 are critical for infection of intestinal organoids (Zang et al,2020). The gene discussed is TMPRSS4; the disease is infection.