They found that the nose and proximal airways contained the highest percentage of angiotensin-converting enzyme 2 (ACE2) expressing ciliated cells and speculated that nasal surfaces might be the dominant initial site for SARS-CoV-2 respiratory tract infection [7]. Consequently, they suggested that complementary therapeutic strategies that reduce viral titer in the nose early in the disease may be beneficial [7]. Here, ACE2 is linked to Respiratory tract infection.