A species-centric co-occurrence network (SCN) of 34 isolates from 26 contaminated ink samples. In the SCN, the bacterial species are presented as nodes, and their co-occurrence relationships were presented as edges (i.e., connection degree). Node size and edge width were weighted by their occurrence counts and frequency of co-occurrence, respectively. The possibly pathogenic species (n=8) and non-pathogenic species (n=14) are colored in red and green, respectively.