Measles in the UK: 100 cases in 90 days, 16 in the last 30

The full briefing

Full 2026 picture: Measles in United Kingdom — reported cases by year, monthly records and every briefing for this pair.

The UK reported 100 measles cases in the 90 days to 27 September. 16 of them came in the 30 days to 27 September, against 33 in the 30 days before.

Why it matters

The UK accounts for 1.1% of the measles cases reported to ENCLAI worldwide so far in 2026. It ranks 8 of 43 reporting countries.

The numbers

Period	Reported cases
Last 30 days (to 27 September)	16
The 30 days before that	33
90 days to 27 September	100
2026 so far (ENCLAI export)	736

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

• A change between two 30-day windows can come from reporting timing as much as from transmission. The source does not say which.

Where to learn more

Measles in the UK: the 2026 picture · Measles worldwide · the UK: all diseases · How to read these counts

Retained reporting context

Sources and limitations

• Four people have already died from measles, an infectious disease that can be prevented by vaccination. We are living in (Mastodon·#measles · 2026-09-27)

• 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

• Editorial review. Reviewed and approved for publication by Dr Natalya Mathur (MD), Founder, Enclai, on 27 Sep 2026.
• Update history. No corrections or updates have been issued for this briefing.
• Spotted an error? Tell us and we will correct it on the record.

Related briefings

• Measles in the US: 1,752 cases in 90 days, 463 in the last 30 12 Nov 2026
• Measles in Ghana: 63 suspected cases in records dated 13 September 12 Nov 2026
• Measles in Ghana: 63 suspected cases in records dated 13 September 11 Nov 2026