Bimorphism of patient symptoms.
a. Distribution of RIC on day 30 after SARS-CoV-2 infection. b. Scatterplot of varied parameters and RIC on day 30. c. Distribution of the severity of COVID-19 patients. The color column shows RIC at day 30 when K4 varies between 40 and 150 and ρ varies within [0, 3 × 10−3]. The black dashed line shows the threshold between mild-moderate and severe cases. Other parameters assigned the default values shown in Table A in S1 Text.