Estimations of diversity within different sample groups.

Feces displayed the highest diversity as measured by the Shannon index, which only considers relative phylotype abundances. According to the Rao coefficient, which also takes phylotype dissimilarities into account, the uninfected stomach harboured highest diversity. Good's estimated coverage shows that throat samples and H. pylori infected stomachs are most completely sampled, where one new phylotype would be expected per 341 additional reads.