EBV	Epstein-Barr virus
NMGDs	non-malignant gastroduodenal disorders
PUD	Peptic ulcer disease
GERD	gastroesophageal reflux disease
NSAIDS	nonsteroidal anti-inflammatory drugs
FD	functional dyspepsia
BabA	blood group antigen binding adhesion
OipA	outer inflammatory protein A
SabA	sialic acid-binding adhesion
VacA	vacuolating cytotoxin A
CagA	cytotoxin associated gene A
CTL	cytotoxic T lymphocytes
NK	natural killer cells
TNF-α	Tumor necrosis factor-α
IFN-γ	interferon-γ
TLR9	toll-like receptor 9
MMP-1	matrix metalloprotease-1
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
EBER	EBV-encoded RNA
EBNA	Epstein–Barr nuclear antigens
VCA	viral capsid antigen
EA	early antigen
PMNC	Polymorphonuclear cells
MNC	mononuclear cells
NAG	Non-atrophic gastritis
BZLF1	BamHI Z Leftward reading Frame 1
BARF1	means BamHI A rightward open-reading frame-1
HCMV	human cytomegalovirus