Partial nucleotide sequences of 16S rRNA and rpo-b for Helicobacter and Acinetobacter and of flgK, GDP-D-mannose dehydratase and UDP-3-O- [3-hydroxymyristoyl] glucosamine Nacyltransferase for Helicobacter from cDNA sequencing, and of env gene for the retrovirus from a PCR product were aligned with the respective homologous sequences available in GenBank using the MEGA version 4 [56] software. The appropriate nucleotide substitution model for each data set was selected by the Akaike information criterion implemented in the Modeltest version 3.7 [62] , and maximum likelihood (ML) trees were reconstructed using PhyML version 2.4.4 [63] . Using the same program (PhyML) nodal supports were estimated with 100 bootstrap replicates. The trees were visualized in FigTree version 1.2.2 (http://tree.bio.ed.ac.uk/software/figtree/).