# Attribution: subnational cholera (cholera/ on the site)

The published files are derived works, released under CC BY 4.0 (LICENSE-DATA) subject to the
source terms below. Changes made: state tables extracted from PDFs, states matched to OCHA COD-AB
admin1 pcodes, rows written in the JHU schema with source document, vintage and method columns,
checks computed. Values are as reported; none are corrected. License status per source is tracked
in `sources.yaml`.

- **Nigeria Centre for Disease Control and Prevention (NCDC)**, cholera situation reports
  ("An update of Cholera outbreak in Nigeria"), 2024 W4 to 2025 W9:
  https://ncdc.gov.ng/diseases/sitreps/. No license stated; case and death counts are published
  as reported facts with full attribution. NCDC does not endorse this use.
- **Sudan weekly cholera cases by state**, ArcGIS layer `Sudan_Weekly_Cholera_Cases_WFL1`
  (WHO ArcGIS Online organisation):
  https://services.arcgis.com/5T5nSi527N4F7luB/arcgis/rest/services/Sudan_Weekly_Cholera_Cases_WFL1/FeatureServer/0.
  No license stated; case counts are published as reported facts with full attribution.
- **World Health Organization**, global cholera and AWD dashboard, national weekly cases
  (`cholera_adm0_week`), via the Humanitarian Data Exchange:
  https://data.humdata.org/dataset/world-health-organization-who-cholera-data. License CC BY-IGO 3.0.
  Used as a reference series. WHO does not endorse this use.
- **JHU global cholera surveillance dataset** (Johns Hopkins Bloomberg School of Public Health),
  OSF project 2ncf7: https://osf.io/2ncf7/. License CC BY 4.0. Column set and dtypes, and the 2022
  Nigeria series in the method chart.
- **COD-AB administrative boundaries**, OCHA, via HDX: https://data.humdata.org/dataset/cod-ab-nga,
  https://data.humdata.org/dataset/cod-ab-sdn. License CC BY-IGO 3.0. Published simplified as
  `admin1.geojson`.