Latin America 21 Sep 2026 · Dr Natalya Mathur
ENCLAI ID ENCLAI-2026-0000421-2 · Cite

Flu in Mexico: 1,509 cases in 90 days, 1,022 in the last 30

ENCLAI SURVEILLANCE BRIEFING · 21 SEPTEMBER 2026Flu in Mexico: 1,509 cases in 90 days,1,022 in the last 30Seasonal influenza · Mexico · reported cases1,022reported cases in the 30 days to 21September▲ 110% more than the 30 days before (487)487The 30 daysbefore1,50990 days to 21September33,0322026 so far4 of 39rank, reportingcountriesThree 30-day windows48730 days before1,022Last 30 daysLargest counts, last 90 daysAustralia29,378Spain2,500The UK2,442Norway1,832Mexico1,509Germany1,29731 countries with a reported count in this windowWhat this briefing shows1Reported cases rose from 487 to 1,022 between the two latest 30-daywindows, 110% more.2Mexico accounts for 1.2% of the flu cases reported to ENCLAIworldwide in 2026 and ranks 4 of 39 reporting countries.32025 closed at 402 reported cases.Read with care: reports to official surveillance, not people and not a rate. A change between30-day windows can come from reporting timing as much as from transmission.Source: official surveillance reports compiled by ENCLAI · data as of 2026-09-21 ·enclai.net/newsVerify every figure against the source data before use; ENCLAI does not guarantee accuracy orcompleteness.
  1. Reported cases rose from 487 to 1,022 between the two latest 30-day windows, 110% more.
  2. Mexico accounts for 1.2% of the flu cases reported to ENCLAI worldwide in 2026 and ranks 4 of 39 reporting countries.
  3. 2025 closed at 402 reported cases.
Customise it in Visual Studio
Largest included reported counts (6 of 31 countries) · 2026-06-23 through 2026-09-21 · source-record dates; coverage varies
Australia29,378
Spain2,500
United Kingdom2,442
Norway1,832
Mexico1,509
Germany1,297
Seasonal influenza — Mexico · reported surveillance count · 2026-06-23 through 2026-09-21 · inclusive source-record dates
Seasonal influenza — Mexico · reported surveillance count · 2026-08-22 through 2026-09-21 · inclusive source-record dates
Seasonal influenza — Mexico · reported surveillance count · 2026-07-22 through 2026-08-21 · inclusive source-record dates
Seasonal influenza — Mexico · reported surveillance count · 2025-08-22 through 2025-09-21 · inclusive source-record dates
Seasonal influenza · combined reported surveillance count · 2026-06-23 through 2026-09-21 · inclusive source-record dates
Seasonal influenza · weekly reported-count series · Weeks starting 2026-06-15 through 2026-08-31
Largest included reported counts (6 of 31 countries) · 2026-06-23 through 2026-09-21 · source-record dates; coverage varies

The full briefing

Full 2026 picture: Seasonal influenza in Mexico — reported cases by year, monthly records and every briefing for this pair.

Mexico reported 1,509 flu cases in the 90 days to 21 September. 1,022 of them came in the 30 days to 21 September, against 487 in the 30 days before.

Why it matters

Mexico accounts for 1.2% of the flu cases reported to ENCLAI worldwide so far in 2026. It ranks 4 of 39 reporting countries.

The numbers

PeriodReported cases
Last 30 days (to 21 September)1,022
The 30 days before that487
90 days to 21 September1,509
2026 so far (ENCLAI export)33,032
The card shows flu in Mexico. It compares the last 30 days with the 30 days before, as reported to ENCLAI.
The card shows flu in Mexico. 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

  • 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

Seasonal influenza in Mexico: the 2026 picture · Seasonal influenza worldwide · Mexico: all diseases · How to read these counts

Retained reporting context

Included reporting countries

Seasonal influenza

43,045

combined reported surveillance count

2026-06-23 through 2026-09-21 · inclusive source-record dates

For Seasonal influenza, the combined reported surveillance count across the 31 countries with positive reported counts in this selection is 43,045. The selection uses source-record dates 2026-06-23 through 2026-09-21, inclusive. This covers only these reporting countries; source periods and completeness vary.

Exact included country membership
CountryReported countSource-record dates
Australia29,3782026-06-23 through 2026-09-21
Austria62026-06-23 through 2026-09-21
Belgium1212026-06-23 through 2026-09-21
Bulgaria142026-06-23 through 2026-09-21
Canada7322026-06-23 through 2026-09-21
Switzerland2032026-06-23 through 2026-09-21
Czechia92026-06-23 through 2026-09-21
Germany1,2972026-06-23 through 2026-09-21
Denmark2232026-06-23 through 2026-09-21
Spain2,5002026-06-23 through 2026-09-21
Estonia262026-06-23 through 2026-09-21
Finland1592026-06-23 through 2026-09-21
France3272026-06-23 through 2026-09-21
United Kingdom2,4422026-06-23 through 2026-09-21
Croatia282026-06-23 through 2026-09-21
Hungary22026-06-23 through 2026-09-21
Ireland6772026-06-23 through 2026-09-21
Iceland242026-06-23 through 2026-09-21
Luxembourg892026-06-23 through 2026-09-21
Mexico1,5092026-06-23 through 2026-09-21
Malta6472026-06-23 through 2026-09-21
Netherlands1882026-06-23 through 2026-09-21
Norway1,8322026-06-23 through 2026-09-21
Nepal222026-06-23 through 2026-09-21
Portugal1562026-06-23 through 2026-09-21
Romania22026-06-23 through 2026-09-21
Slovakia252026-06-23 through 2026-09-21
Slovenia122026-06-23 through 2026-09-21
Sweden1832026-06-23 through 2026-09-21
Taiwan112026-06-23 through 2026-09-21
United States2012026-06-23 through 2026-09-21

Snapshot 2026-09-21

Weekly reporting history

Seasonal influenza

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. Exact country membership could not be reconciled to the current primary snapshot.

Retained weekly report series
WeekReported count
2026-06-15 through 2026-06-2118441
2026-06-22 through 2026-06-2816154
2026-06-29 through 2026-07-0514122
2026-07-06 through 2026-07-1212647
2026-07-13 through 2026-07-1916895
2026-07-20 through 2026-07-2612995
2026-07-27 through 2026-08-0217640
2026-08-03 through 2026-08-0910946
2026-08-10 through 2026-08-1621685
2026-08-17 through 2026-08-2317998
2026-08-24 through 2026-08-3024121
2026-08-31 through 2026-09-0625935

Snapshot 2026-09-20

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

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