Europe 25 Sep 2026 · Dr Natalya Mathur
ENCLAI ID ENCLAI-2026-0000437-8 · Cite

West Nile fever in Greece: 740 cases in the year to September

ENCLAI SURVEILLANCE BRIEFING · 25 SEPTEMBER 2026West Nile fever in Greece: 740 cases inthe year to SeptemberWest Nile fever · Greece · reported cases740reported cases in the year to 25 September1 of 7rank, reporting countriesLargest counts, last 12 monthsThe US1,633Greece740Italy46Romania14France8The UK513 countries with a reported count in this windowWhat this briefing shows1Greece reported 740 west nile fever cases in the 12 months to 25September.2Greece accounts for 52.3% of the west nile fever cases reported toENCLAI worldwide in 2026 and ranks 1 of 7 reporting countries.Read with care: reports to official surveillance, not people and not a rate. Coverage andreporting periods differ by country.Source: official surveillance reports compiled by ENCLAI · data as of 2026-09-25 ·enclai.net/newsVerify every figure against the source data before use; ENCLAI does not guarantee accuracy orcompleteness.
  1. Greece reported 740 west nile fever cases in the 12 months to 25 September.
  2. Greece accounts for 52.3% of the west nile fever cases reported to ENCLAI worldwide in 2026 and ranks 1 of 7 reporting countries.
Customise it in Visual Studio
Largest included reported counts (6 of 13 countries) · 2025-09-25 through 2026-09-25 · source-record dates; coverage varies
United States1,633
Greece740
Italy46
Romania14
France8
United Kingdom5
West Nile fever — Greece · reported surveillance count · 2025-09-25 through 2026-09-25 · inclusive source-record dates
West Nile fever — Greece · reported surveillance count · 2026-08-26 through 2026-09-25 · inclusive source-record dates
West Nile fever — Greece · reported surveillance count · 2026-07-26 through 2026-08-25 · inclusive source-record dates
West Nile fever — Greece · reported surveillance count · 2025-08-26 through 2025-09-25 · inclusive source-record dates
West Nile fever · combined reported surveillance count · 2025-09-25 through 2026-09-25 · inclusive source-record dates
West Nile fever · weekly reported-count series · Weeks starting 2026-06-15 through 2026-08-31
Largest included reported counts (6 of 13 countries) · 2025-09-25 through 2026-09-25 · source-record dates; coverage varies

The full briefing

Full 2026 picture: West Nile fever in Greece — reported cases by year, monthly records and every briefing for this pair.

Greece reported 740 west nile fever cases in the year to 25 September. No counts have been reported for 26 August to 25 September. Missing reports do not mean zero cases.

Why it matters

Greece accounts for 52.3% of the west nile fever cases reported to ENCLAI worldwide so far in 2026. It ranks 1 of 7 reporting countries.

The numbers

PeriodReported cases
Last 30 days (to 25 September)not yet reported
Year to 25 September740
2026 so far (ENCLAI export)740
The card shows west nile fever in Greece. It compares the last 30 days with the 30 days before, as reported to ENCLAI.
The card shows west nile fever in Greece. It compares the last 30 days with the 30 days before, as reported to ENCLAI.

What the source says

These figures come from official surveillance reports. They count reports, not people. They are not an incidence rate, the rate of new cases in a population. They do not cover the whole population. The reporting periods do not match these dates exactly. Some reports are incomplete or still in progress. Some run past the window. Some reports do not say which date they use: symptom onset, notification, or confirmation.

Caveats

  • No counts have been reported for 26 August to 25 September. Missing reports do not mean zero cases.
  • Only 7 countries have reported west nile fever to ENCLAI this year. The worldwide share is a share of that small set.

Where to learn more

West Nile fever in Greece: the 2026 picture · West Nile fever worldwide · Greece: all diseases · How to read these counts

Retained reporting context

Included reporting countries

West Nile fever

2,459

combined reported surveillance count

2025-09-25 through 2026-09-25 · inclusive source-record dates

For West Nile fever, the combined reported surveillance count across the 13 countries with positive reported counts in this selection is 2,459. The selection uses source-record dates 2025-09-25 through 2026-09-25, inclusive. This covers only these reporting countries; source periods and completeness vary.

Exact included country membership
CountryReported countSource-record dates
Argentina12025-09-25 through 2026-09-25
Australia22025-09-25 through 2026-09-25
Austria12025-09-25 through 2026-09-25
Canada22025-09-25 through 2026-09-25
Germany32025-09-25 through 2026-09-25
Spain32025-09-25 through 2026-09-25
France82025-09-25 through 2026-09-25
United Kingdom52025-09-25 through 2026-09-25
Greece7402025-09-25 through 2026-09-25
Italy462025-09-25 through 2026-09-25
Netherlands12025-09-25 through 2026-09-25
Romania142025-09-25 through 2026-09-25
United States1,6332025-09-25 through 2026-09-25

Snapshot 2026-09-25

Weekly reporting history

West Nile fever

weekly reported-count series

Weeks starting 2026-06-15 through 2026-08-31

A retained retrospective weekly reported-count series across included reporting countries. Country membership and reporting completeness can vary by week. Missing weeks remain gaps. This is a separate report-series measure; it does not establish exact incidence or laboratory confirmation.

Retained weekly report series
WeekReported count
2026-06-15 through 2026-06-210
2026-06-22 through 2026-06-280
2026-06-29 through 2026-07-052
2026-07-06 through 2026-07-120
2026-07-13 through 2026-07-196
2026-07-20 through 2026-07-265
2026-07-27 through 2026-08-025
2026-08-03 through 2026-08-0911
2026-08-10 through 2026-08-1615
2026-08-17 through 2026-08-2319
2026-08-24 through 2026-08-3015
2026-08-31 through 2026-09-060

Snapshot 2026-09-24

Sources and limitations

  • Window. Each quantity keeps its recorded source-selection dates and coverage notes. Dated batches and weekly or genomic observations retain their separate measures. Publication or capture dates do not establish case onset, equal cohorts or period completeness.
  • Denominator. The retained counts do not establish complete populations, equal reporting cohorts or incidence rates. Source period bounds and definitions can differ.
  • Case definition. Case definitions are set nationally and change over time. Counts for the same disease in different countries may not be counting the same thing.
  • Revisions. Agencies restate figures. Values here are as reported at the time of publication; see the update history below.

ENCLAI counts reflect verified records available from reporting sources for the stated window. They are not estimates of total incidence and should not be interpreted as medical advice. Full methodology: the dataset.

Review and corrections

Share this briefing
ENCLAI tracks outbreaks like this live, from official sources worldwide. Start 7-day free trial  ·  Request a demo →

Follow ENCLAI News

Get new briefings in your news reader. No ENCLAI account needed.

Follow in Feedly Open RSS feed

The daily disease brief

One email a day: what changed in official disease reporting worldwide, with the source named for every number. Reported facts only — no forecasts and no interpretation.

Double opt-in — we send a confirmation link and nothing else until you click it. One-click unsubscribe on every email. See our privacy notice.