Helicobacter pylori is a Gram-negative, microaerophilic, spiral-shaped rod in the family Helicobacteraceae, uniquely adapted to colonise the human gastric mucosa through the production of urease that neutralises stomach acid. It infects approximately half of the global population and is the primary cause of chronic gastritis, peptic ulcer disease, and is classified as a class I carcinogen due to its strong association with gastric adenocarcinoma and mucosa-associated lymphoid tissue (MALT) lymphoma. H. pylori exhibits exceptional genomic diversity driven by high mutation and recombination rates, reflecting a long co-evolutionary history with its human host spanning at least 100,000 years.
Derived from 2,239 genomes: 376 from RefSeq and 1,863 from other sources. For the derivation pipeline and the PASS / WARN / FAIL verdict model, see the methods page for qualibact-v1.0.
This table summarises the distribution of each metric, including standard deviation, mean, median, and percentiles.
A combined summary table across all species is available on the summary page.
| Metric | Distribution | n | Mean | SD | Min | Q1 | Median | Q3 | Max |
|---|---|---|---|---|---|---|---|---|---|
| N50 | non-normal | 1,863 | 90,458 | 33,247 | 20,268 | 67,990 | 82,516 | 104,658 | 247,242 |
| no_of_contigs | non-normal | 1,863 | 54.33 | 18.35 | 20 | 42 | 51 | 62 | 175 |
| longest | non-normal | 1,863 | 226,709 | 81,416 | 64,641 | 172,192 | 225,860 | 270,090 | 556,175 |
| GC_Content | non-normal | 1,863 | 38.92 | 0.15 | 38.51 | 38.81 | 38.91 | 39.02 | 39.37 |
| Completeness_Specific | non-normal | 1,863 | 99.99 | 0.01 | 99.95 | 99.99 | 99.99 | 99.99 | 100 |
| Contamination | non-normal | 1,863 | 0.11 | 0.17 | 0 | 0.01 | 0.03 | 0.14 | 1.77 |
| Total_Coding_Sequences | non-normal | 1,863 | 1,568 | 40.75 | 1,454 | 1,538 | 1,568 | 1,597 | 1,692 |
| Genome_Size | non-normal | 1,863 | 1,624,833 | 37,697 | 1,508,313 | 1,594,831 | 1,634,123 | 1,655,163 | 1,705,736 |
Full statistics including KS test vs RefSeq and Wasserstein distance are in the downloadable summary.csv.
Derived from 2,239 genomes including 376 RefSeq references
Both Fail and Warn bands shown as the published rounded values — easier to cite and consistent across the species page, CSV downloads, and downstream QC tools.
| Metric | Fail below | Warn below | Warn above | Fail above |
|---|---|---|---|---|
| Genome_Size | - | - | - | - |
| GC_Content | - | - | - | - |
| Total_Coding_Sequences | - | - | - | - |
| Completeness_Specific | - | - | - | - |
| Contamination | - | - | - | - |
| N50 | - | - | - | - |
| no_of_contigs | - | - | - | - |
| longest | - | - | - | - |
How to read this: A value outside a failure limit fails QC. Within the failure limits, values beyond a warning limit are borderline and worth a manual look; values within the warning limits pass that criterion. A dash means that no bound is defined on that side.