Fig 6. Fifty bacterial families that best differentiate microbiomes of healthy and infected milk.

Difference was calculated by subtracting the lesser of the mean abundances from the greater. Families along the y-axis are sorted by class and labeled with the percent of overall milk microbiome sequences that each class represented. Color and direction of bar indicates whether healthy or infected glands was enriched in each taxa. X-axis represents natural log of fold change increase of abundance between infection status; a constant of 1.0 was added to avoid undefined numbers in the case that a family was absent. This occurred in the case of Shewanellaceae (absent in healthy), Gordoniaceae, and Listeriaceae (both absent in infected). Scale is positive in both directions from zero along axis. Red dotted line indicates mean log fold-change increase of presented families. Sequences that could not be classified to family are excluded. Dot to the right of taxon denotes fdr ≤ 0.9 via Kruskal Wallis test.