This research was performed to explore the biological changes of Enterococcus faecalis strain N41 in biofilm formation, adhesion and anti-phagocytosis characteristics when the N41 strain was co-cultivated with other bacteria such as E.coli O157 ∶H7, Salmonella enteritidis subspecies ATCC14028, and staphylococcus aureus ATCC25923. The biofilm production was detected by 1% crystal violet dyeing method, the potentials of adhesion to porcine intestinal epithelial cells(IPEC) and anti-phagocytosis to mouse perit...