---
pretty_name: ECDC ERVISS — ILI/ARI primary-care consultation rates
license: other
size_categories:
- 10K<n<100K
tags:
- cadence-weekly
- geo-eu
- surveillance-respiratory
- pathogen-influenza
- tier-1
- availability-open
schema_version: '0.1'
source_id: ecdc-erviss
source_url: https://github.com/EU-ECDC/Respiratory_viruses_weekly_data
manifest_section: §5.3
surveillance_category: respiratory
pathogens:
- influenza
- sars-cov-2
- rsv
availability: open
availability_notes: null
access_type: github
tier: 1
cadence: weekly
geography_levels:
- national
geography_countries:
- AT
- BE
- BG
- CY
- CZ
- DE
- DK
- EE
- ES
- FI
- FR
- GR
- HR
- HU
- IE
- IS
- IT
- LI
- LT
- LU
- LV
- MT
- NL
- 'NO'
- PL
- PT
- RO
- SE
- SI
- SK
gold_standard_for: []
vintaged_version_of: null
succeeds: null
derived_from: []
value_columns:
- name: ili_rate
  unit: consultations per 100,000 population
  value_type: rate
  description: Influenza-like illness primary-care consultation rate per 100,000 population per ECDC ERVISS methodology.
  aggregation: rate
- name: ari_rate
  unit: consultations per 100,000 population
  value_type: rate
  description: Acute respiratory infection primary-care consultation rate per 100,000 population. Broader case definition
    than ILI.
  aggregation: rate
notes:
  extra_columns:
  - column: age
    description: Reporting age band (`0-4`, `5-14`, `15-64`, `65+`, `total`). Filter to `total` for population-wide series.
  - column: location_name
    description: Source's English country name. `location_id` (ISO 3166-1 alpha-2) is canonical.
  interpretation_caveats:
  - column: ili_rate
    caveat: ILI is a *symptomatic* signal — patients meeting the ECDC ILI case definition (sudden fever ≥38°C plus cough/sore
      throat) regardless of lab confirmation. Captures non-flu respiratory illness too. Pair with ERVISS sentinel virological
      positivity for lab-confirmed flu.
  - column: ari_rate
    caveat: ARI is broader than ILI — any acute respiratory infection without requiring fever. Counts will exceed `ili_rate`
      and include more non-influenza causes.
  - column: location_id
    caveat: Greece is `GR` (ISO 3166-1 alpha-2). ECDC's internal `EL` code is not used in this dataset.
  general: 'ECDC''s ERVISS aggregates respiratory virus surveillance from 30+ EU/EEA countries.

    This dataset is the **primary-care syndromic** slice (ILI and ARI consultation rates);

    additional ERVISS slices (sentinel virological positivity, SARI severity, variants)

    can be added as sibling datasets later.


    Data is published weekly to the public GitHub repo at

    `EU-ECDC/Respiratory_viruses_weekly_data`. Each weekly commit is a snapshot —

    vintaged history is available via git but is not surfaced as `as_of` in this

    dataset.

    '
extra:
  github_repo: https://github.com/EU-ECDC/Respiratory_viruses_weekly_data
  source_csv: data/ILIARIRates.csv
  erviss_dashboard: https://erviss.org/
computed:
  last_ingested: '2026-04-26T01:58:56Z'
  row_count: 26751
  time_coverage:
  - start: '2021-06-27'
    end: '2026-04-19'
  geography_unit_count: 28
  observed_cadence_days: 7
  missing_gaps: []
  data_hash: 1df84f26f0055222
---

# ECDC ERVISS — ILI/ARI primary-care consultation rates

ECDC's ERVISS aggregates respiratory virus surveillance from 30+ EU/EEA countries.
This dataset is the **primary-care syndromic** slice (ILI and ARI consultation rates);
additional ERVISS slices (sentinel virological positivity, SARI severity, variants)
can be added as sibling datasets later.

Data is published weekly to the public GitHub repo at
`EU-ECDC/Respiratory_viruses_weekly_data`. Each weekly commit is a snapshot —
vintaged history is available via git but is not surfaced as `as_of` in this
dataset.

**Source:** <https://github.com/EU-ECDC/Respiratory_viruses_weekly_data>

## Coverage

- **Time:** 2021-06-27 → 2026-04-19
- **Cadence:** `weekly` (observed median spacing: 7 days)
- **Geography levels:** `national` — 28 unique location IDs
- **Countries:** AT, BE, BG, CY, CZ, DE, DK, EE, ES, FI, FR, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MT, NL, NO, PL, PT, RO, SE, SI, SK
- **Pathogens:** `influenza`, `sars-cov-2`, `rsv`
- **Surveillance category:** `respiratory`
- **Rows:** 26,751

## Columns

| Column | Unit | value_type | Aggregation | Description |
|--------|------|------------|-------------|-------------|
| `ili_rate` | consultations per 100,000 population | `rate` | `rate` | Influenza-like illness primary-care consultation rate per 100,000 population per ECDC ERVISS methodology. |
| `ari_rate` | consultations per 100,000 population | `rate` | `rate` | Acute respiratory infection primary-care consultation rate per 100,000 population. Broader case definition than ILI. |

### Additional data columns

- **`age`** — Reporting age band (`0-4`, `5-14`, `15-64`, `65+`, `total`). Filter to `total` for population-wide series.
- **`location_name`** — Source's English country name. `location_id` (ISO 3166-1 alpha-2) is canonical.

## Interpretation caveats

Things that may differ from how other sources define a similar measure. If you're combining this dataset with another, read these first.

- **`ili_rate`** — ILI is a *symptomatic* signal — patients meeting the ECDC ILI case definition (sudden fever ≥38°C plus cough/sore throat) regardless of lab confirmation. Captures non-flu respiratory illness too. Pair with ERVISS sentinel virological positivity for lab-confirmed flu.
- **`ari_rate`** — ARI is broader than ILI — any acute respiratory infection without requiring fever. Counts will exceed `ili_rate` and include more non-influenza causes.
- **`location_id`** — Greece is `GR` (ISO 3166-1 alpha-2). ECDC's internal `EL` code is not used in this dataset.

## Access

- **Availability:** `open`
- **Access type:** `github`
- **License:** other
- **Tier:** 1

---

*Schema version `0.1` · Last ingested 2026-04-26T01:58:56Z · `source_id: ecdc-erviss` · Manifest section §5.3*