Fig. 1

A principal coordinate analysis (PCoA) plot showing the similarity relationship between saliva samples from 12 patients at three phases of treatment using unweighted (a) and weighted (b) UniFrac distance matrices with the primary eradication regimen. 0 W, baseline; 1 W, date of treatment completion (1 week); 7 W, determination of date of H. pylori eradication (7 weeks). The ellipse covers 67% of the samples belonging to each phase group