Amino acid alignment of 42 babA diversity region fragments. Amino acid translations of nucleotide sequences were performed using GCG Translate, and sequences were aligned using GCG Pileup. A consensus sequence (based on a plurality of 10) was determined using GCG Pretty, and all the sequences were displayed using Boxshade 3.2. The dots refer to sites where amino acids match those of the consensus sequence, the hyphens represent deletions, the asterisks represent sites where the consensus sequence is indeterminate, and the boxes are used to separate different allele groups among the babA sequences. Each allele group is based on amino acids 306 to 334 and is represented at the right of the alignment. The babA diversity alleles 1 to 5 are represented as AD1 to AD5, respectively.