Methodology
Data sources & methodology
We don't generate primary epidemiological data. We aggregate, normalise and link back to official sources. Every data point on the map is traceable.
| Source | Role | Update frequency | |
|---|---|---|---|
| WHO Disease Outbreak News | Official global outbreak bulletins | On report | Visit |
| CDC NNDSS | US weekly notifiable disease reports | Weekly | Visit |
| ECDC Surveillance Atlas | European annual surveillance data | Annual | Visit |
| PAHO/WHO Americas | Latin American case counts and alerts | Weekly–monthly | Visit |
| ProMED | Community-curated outbreak signals | Continuous | Visit |
Methodology
- Active alerts are pulled from WHO DON and ProMED feeds and de-duplicated.
- Historical cases are joined to country/region geographies (ISO 3166).
- Endemic zones are derived from long-term published epidemiology, not from individual alerts.
- We prefer incomplete transparency over false precision — when data is sparse we say so.
Limitations
- Public surveillance lags real events by days, weeks or months.
- Reporting coverage and case definitions vary between countries.
- Country-level polygons don't reflect within-country variation.