Evidences have shown the nCOV transmitted from person to person. I.e., if extracted the transmission in graph model, a person transmitted to one another through an edge (Demo 1). Consider that A infects B, then B infects C, then C to D… This makes the tree-like path (Demo 2). However, given cross-infection, repeated use of the public places and transportation, the spreading path of the virus becomes a network structure.

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