Species Characteristics
| Species | Family | Predominant habitat(s) | Genome size[ii] | ORFs | %G + C content |
| Escherichia coli K-12, strain MG1655 | Enterobacteriaceae | Mammalian intestine; contaminated food/water | 4,639,221 bp (C) | 4290 | 50.7 |
| Salmonella enterica serovar Typhi CT-18 | Enterobacteriaceae | Human intestine & bloodstream; contaminated food/water | 4,809,037 bp (C) | 4599 | 52.1 |
| Yersinia pestis CO-92, Biovar Orientalis | Enterobacteriaceae | Human & rodent bloodstream | 4,653,728 bp (C) | 4012 | 47.6 |
| Buchnerasp. APS | Enterobacteriaceae, aphid endosymbionts | bacteriocytes of aphid (obligate endosymbiont) | 640,681 bp (C) | 583 | 26.3 |
| Haemophilus influenzae Rd, strain KW20 | Pasteurellaceae | Human nasopharynx | 1,830,138 bp (C) | 1738 | 38.0 |
| Vibrio cholerae El Tor, strain N16961 | Vibrionaceae | Human small bowel | 4,033,464 bp (C) | 3890 | 47.5 |
| Shewanella oneidensisMR-1 | Alteromonadaceae | Fresh & marine water/sediments | ∼4.50 Mbp (P) | n.a. | ∼46 |
| Pseudomonas aeruginosaPAO1 | Pseudomonadaceae | Soil; human opportunistic pathogen | 6,264,403 bp (C) | 5570 | 66.6 |
| Acidithiobacillus ferrooxidans ATCC 23270 | Unclassified | Acidic water/soil | ∼2.90 Mbp (P) | n.a. | ∼59 |
| Xylella fastidiosa strain 9a5c | Xanthomonas | Xylem of host plant | 2,679,306 bp (C) | 2782 | 52.7 |
[i] ORFs indicates open reading frames; n.a., not available.
[ii] Genome sizes are from the chromosome data only and do not include plasmid sequences; C indicates complete genome; P, genome sequencing in gap closure.