CBA	cytometric bead array
CFU	colony-forming units
DCs	dendritic cells
DSS	dextran sulfate sodium
HPF	high power fields
IL	interleukin
LOS	lipo-oligosaccharide
LPS	lipo-polysaccharide
MLN	mesenteric lymph nodes
n.s.	not significant
PBS	phosphate buffered saline
PACAP	pituitary adenylate cyclase-activating polypeptide
p.i.	post-infection
SPF	specific pathogen free
Th1	T helper cell-1
TLR	toll-like receptor
TNF-α	tumor necrosis factor-α
Treg	regulatory T cells
VIP	vasoactive intestinal peptide