Table 2. Virulence Factors and Their Functions.

gene	function
chuA	E. coli heme uptake
fyuA	siderophore (yersiniabactin uptake)
ompT	surface protease
tspE	anonymous DNA fragment
yjaA	hypothetical protein
usp	bacteriocin
capII	group II capsule antigen
iucD	siderophore (aerobactin)
iha	irgA homologue adhesin
sat	secreted autotransporter toxin
prf	adhesion (P-related fimbriae)
iroN	siderophore (salmochelin)
hlyA	hemolysin
sfa	adhesion (S-fimbriae)
cnf1	cytotoxic necrotizing factor
Dr	adhesion (Dr family)