Before revision:  SARS-Cov-2 degrades ACE2 and thus worsens lung injury, causes vasoconstriction, thrombotic problems, and exacerbated inflammatory response . I developed a mathematical model based on the influence of ACE2 on viral propagation and on the negative effects of its degradation .
After revision:  SARS-Cov-2 degrades ACE2 and thus worsens lung injury, causes vasoconstriction, thrombotic problems, and exacerbated inflammatory response and thrombotic problems may derive from increased Angiotensin II (Ang-II) level that results from degradation of ACE2 by the virus. I present here a mathematical model based on the influence of ACE2 on viral propagation and on the negative effects of its degradation .