Fig. 3

Disease-disease association network (DDAN). a DDAN, including COVID19, red nodes represent the diseases that are directly direct linked to COVID19. b Scatter plot shows the degree distribution of DDAN, which does not follow the scale-free property. c The average path length between the diseases in DDNA and distribution of average path length of 1000 random networks (green). d Transitivity of DDNA and distribution of transitivity of 1000 random networks (pink)