ACE2 and infection: Some have called into question the expression of angiotensin-converting enzyme 2 (ACE2), the primary receptor for SARS-CoV-2, in macrophage populations, and in vitro studies indicate infection of monocyte-derived macrophages and dendritic cells (DCs) with SARS-CoV-2 is abortive and does not support virus replication (20, 31, 34, 37, 38).