ACE2 and infection: The inability of SARS-CoV-2 to infect human ECs is supported by low ACE2 expression in the highly vascularized lower respiratory tract (22), CDC and primary human EC infection findings (1, 14, 22), and the presence of ACE2 in vascular smooth muscle and heart muscle cells (11, 18, 23, 24) but not the EC lining of vessels (12, –, 14, 23).