Table 1. Prevalences of known bacterial species in each group of milk samples (1 = healthy quarter, somatic cell count < 20,000; 2 = culture negative quarter, somatic cell count ranged from 21,000 to 50,000; 3 = culture negative quarter, somatic cell count >50,000; 4 = non-clinical culture positive quarters, somatic cell count>400,000; 5 = clinical mastitis culture negative quarters).
| Species | 1 | 2 | 3 | 4 | 5 |
| Propionibacterium acnes | 11.37 | 9.05 | 13.26 | 8.35 | 2.76 |
| Geobacillus pallidus | 8.98 | 8.93 | 6.97 | 10.08 | 5.09 |
| Caulobacter leidyia | 0.00 | 0.36 | 0.35 | 0.00 | 20.55 |
| Streptococcus uberis | 2.03 | 1.42 | 1.88 | 1.22 | 4.82 |
| Uncultured Bacteroides | 0.63 | 2.03 | 2.71 | 1.26 | 0.00 |
| Staphylococcus epidermidis | 1.82 | 1.57 | 1.51 | 1.13 | 0.00 |
| Uncultured Bacteroides | 0.63 | 2.03 | 2.71 | 0.54 | 0.00 |
| Uncultured Fusobacteria | 0.00 | 0.00 | 0.00 | 0.00 | 5.49 |
| Uncultured Clostridiales | 0.65 | 0.00 | 2.29 | 1.99 | 0.00 |
| Uncultured Porphyromonas | 0.58 | 0.48 | 0.60 | 0.32 | 2.46 |
| Porphyromonas levii | 0.46 | 0.51 | 0.46 | 0.41 | 2.09 |
| Staphylococcus equorum | 0.58 | 0.52 | 0.52 | 0.46 | 1.40 |
| Lactobacillus johnsonii | 0.71 | 0.95 | 0.79 | 0.68 | 0.00 |
| Bacteroides heparinolyticus | 0.81 | 0.43 | 0.44 | 0.00 | 1.30 |
| Uncultured Firmicutes | 1.50 | 0.95 | 0.00 | 0.00 | 0.00 |
| Staphylococcus chromogenes | 0.00 | 0.00 | 0.00 | 2.27 | 0.00 |
| Clostridiales bacterium | 0.00 | 2.10 | 0.00 | 0.00 | 0.00 |
| Fusobacterium necrophorum | 0.47 | 0.39 | 0.71 | 0.43 | 0.00 |
| Bacteroides fragilis | 0.53 | 0.54 | 0.52 | 0.38 | 0.00 |
| Bacteroides vulgatus | 0.94 | 1.00 | 0.00 | 0.00 | 0.00 |
| Prevotella | 0.00 | 0.00 | 0.00 | 1.14 | 0.70 |
| Uncultured Proteobacterium | 0.00 | 0.00 | 1.58 | 0.00 | 0.00 |
| Lactobacillus acidophilus | 0.00 | 0.51 | 0.54 | 0.30 | 0.00 |
| Comamonas kerstersii | 1.32 | 0.00 | 0.00 | 0.00 | 0.00 |
| Lactobacillus reuteri | 0.00 | 0.75 | 0.00 | 0.48 | 0.00 |
| Ureaplasma diversum | 0.00 | 0.00 | 0.00 | 0.00 | 1.23 |
| Bacteroides coprophilus | 1.13 | 0.00 | 0.00 | 0.00 | 0.00 |
| Acidovorax | 0.00 | 1.12 | 0.00 | 0.00 | 0.00 |
| Kocuria | 0.43 | 0.00 | 0.66 | 0.00 | 0.00 |
| Paenibacillus borealis | 0.00 | 0.00 | 0.00 | 0.00 | 1.03 |
| Uncultured Prevotella | 0.00 | 0.00 | 0.00 | 0.00 | 0.96 |
| Uncultured Helcococcus | 0.00 | 0.39 | 0.00 | 0.54 | 0.00 |
| Uncultured Lachnospiraceae | 0.00 | 0.88 | 0.00 | 0.00 | 0.00 |
| Corynebacterium falsenii | 0.00 | 0.34 | 0.00 | 0.00 | 0.53 |
| Enterococcus faecalis | 0.33 | 0.49 | 0.00 | 0.00 | 0.00 |
| Faecalibacterium prausnitzii | 0.82 | 0.00 | 0.00 | 0.00 | 0.00 |
| Rhodanobacter | 0.35 | 0.00 | 0.41 | 0.00 | 0.00 |
| Staphylococcus aureus | 0.32 | 0.39 | 0.00 | 0.00 | 0.00 |
| Uncultured Staphylococcus | 0.00 | 0.00 | 0.38 | 0.00 | 0.33 |
| Uncultured Halomonas | 0.35 | 0.33 | 0.00 | 0.00 | 0.00 |
| Histophilus somni | 0.00 | 0.00 | 0.00 | 0.00 | 0.66 |
| Bacteroides denticanum | 0.00 | 0.31 | 0.35 | 0.00 | 0.00 |
| Bacillus | 0.00 | 0.00 | 0.00 | 0.00 | 0.63 |
| Ochrobactrum pseudogrignonense | 0.00 | 0.00 | 0.00 | 0.00 | 0.57 |
| Staphylococcus | 0.00 | 0.00 | 0.00 | 0.54 | 0.00 |
| Helcococcus ovis | 0.00 | 0.00 | 0.00 | 0.00 | 0.53 |
| Clostridium | 0.00 | 0.52 | 0.00 | 0.00 | 0.00 |
| Piscibacillus | 0.00 | 0.00 | 0.00 | 0.49 | 0.00 |
| Trueperella pyogenes | 0.00 | 0.00 | 0.00 | 0.00 | 0.43 |
| Delftia spp. | 0.00 | 0.00 | 0.00 | 0.00 | 0.40 |
| Uncultured Clostridia | 0.00 | 0.00 | 0.00 | 0.40 | 0.00 |
| Escherichia coli | 0.00 | 0.00 | 0.00 | 0.00 | 0.37 |
| Mycoplasma bovigenitalium | 0.00 | 0.00 | 0.00 | 0.00 | 0.37 |
| Uncultured Ruminococcaceae | 0.00 | 0.00 | 0.00 | 0.00 | 0.37 |
| Rhodanobacter terrae | 0.00 | 0.36 | 0.00 | 0.00 | 0.00 |
| Brevibacillus parabrevis | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 |
| Uncultured Bacteroidetes | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 |
| Xanthomonas campestris | 0.00 | 0.00 | 0.00 | 0.00 | 0.33 |
| Geobacillus | 0.00 | 0.00 | 0.00 | 0.32 | 0.00 |
| Uncultured bacteria | 14.19 | 16.97 | 17.21 | 12.32 | 11.86 |
Prevalence of all bacteria that were not identified at species level (uncultured bacteria) were summed and presented in the last line of the table.