The majority (approximately 83%) of ACE2-expressing cells are alveolar epithelial type II cells (AECII) (Zou et al. 2020) suggesting that SARS-CoV-2 has a high affinity for lung tissue and subsequent infection, although it is also expressed in many extrapulmonary tissues including heart, kidney, endothelium, and the small intestine (Crackower et al. 2002; Danilczyk et al. 2006; Hamming et al. 2004). The gene discussed is ACE2; the disease is infection.