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“Background Helicobacter pylori infection increases the risk of peptic ulcers and gastric adenocarcinoma of

the human stomach [1–3]. H. pylori adherence to the gastric epithelium and deliver effectors to induce inflammation [4, 5]. One of the best-studied adhesins is the blood group antigen binding adhesin (BabA), which binds Lewis b (Leb) and related ABO antigens [6, 7]. Putative adhesin, BabB, is encoded by babB, which shares Methane monooxygenase nearly identical N- and C-terminal sequences with babA[7, 8]. The reversed chromosomal locations of babA and babB between strain J99 and 26695 prove the recombination events between these two genes [9, 10]. The two genes also show both geographic and allelic variation [11]. Moreover, the duplication of babA or babB gene is mediated by gene conversion between the different chromosomal loci [12–14]. Bäckström et al. [14] demonstrated that the silent babA gene of a Leb-nonbinding strain can be activated by recombination into the babB gene.