Figure 3. (a) and (b) Access route for the SARS-CoV-2 to the CNS via the olfactory route and hematogenous route via direct access or via a Trojan. (c) The hyperinflammatory, hypercoagulable state induced by SARS-CoV-2. (d) The downregulation of ACE2 receptor at the endothelium level. This blocks the conversion of angiotensin I and II into their active metabolites. The decline in Angiotensin (1–7) levels leads to loss of neuroprotective effect and sympathetic hyperactivity. ACE2: angiotensin-converting enzyme 2; ANG (1–7): angiotensin (1–7); SARS-CoV-2: severe acute respiratory syndrome coronavirus 2.