Latin America 11 Nov 2026 · Dr Natalya Mathur
ENCLAI ID ENCLAI-2026-0000810-9 · Cite

Chikungunya in Brazil: 4,816 cases in 90 days, 387 in the last 30

ENCLAI SURVEILLANCE BRIEFING · 11 NOVEMBER 2026Chikungunya in Brazil: 4,816 cases in90 days, 387 in the last 30Chikungunya fever · Brazil · reported cases387reported cases in the 30 days to 11 November▼ 82% fewer than the 30 days before (2,144)2,144The 30 daysbefore2,343Same 30 days, ayear earlier4,81690 days to 11November59,7142026 so farThree 30-day windows2,343A year earlier2,14430 days before387Last 30 daysLargest counts, last 90 daysBrazil4,816The US66Germany9Australia7Spain3Hong Kong210 countries with a reported count in this windowWhat this briefing shows1Reported cases fell from 2,144 to 387 between the two latest 30-daywindows, 82% fewer.2The latest count of 387 is below the 2,343 reported in the same 30days a year earlier.3Brazil accounts for 67.8% of the chikungunya cases reported toENCLAI worldwide in 2026 and ranks 1 of 23 reporting countries.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 2026-11-11 ·enclai.net/newsVerify every figure against the source data before use; ENCLAI does not guarantee accuracy orcompleteness.
  1. Reported cases fell from 2,144 to 387 between the two latest 30-day windows, 82% fewer.
  2. The latest count of 387 is below the 2,343 reported in the same 30 days a year earlier.
  3. Brazil accounts for 67.8% of the chikungunya cases reported to ENCLAI worldwide in 2026 and ranks 1 of 23 reporting countries.
Customise it in Visual Studio
Largest included reported counts (6 of 10 countries) · 2026-08-14 through 2026-11-11 · source-record dates; coverage varies
Brazil4,816
United States66
Germany9
Australia7
Spain3
Hong Kong2
Chikungunya fever — Brazil · reported surveillance count · 2026-08-14 through 2026-11-11 · inclusive source-record dates
Chikungunya fever — Brazil · reported surveillance count · 2026-10-13 through 2026-11-11 · inclusive source-record dates
Chikungunya fever — Brazil · reported surveillance count · 2026-09-13 through 2026-10-12 · inclusive source-record dates
Chikungunya fever — Brazil · reported surveillance count · 2025-10-13 through 2025-11-11 · inclusive source-record dates
Chikungunya fever · combined reported surveillance count · 2026-08-14 through 2026-11-11 · inclusive source-record dates
Chikungunya fever · weekly reported-count series · Weeks starting 2026-08-03 through 2026-10-19
Largest included reported counts (6 of 10 countries) · 2026-08-14 through 2026-11-11 · source-record dates; coverage varies

The full briefing

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

Brazil reported 4,816 chikungunya cases in the 90 days to 11 November. 387 of them came in the 30 days to 11 November, against 2,144 in the 30 days before. The same 30 days a year earlier had 2,343.

Why it matters

Brazil accounts for 67.8% of the chikungunya cases reported to ENCLAI worldwide so far in 2026. It ranks 1 of 23 reporting countries.

The numbers

PeriodReported cases
Last 30 days (to 11 November)387
The 30 days before that2,144
Same 30 days a year earlier2,343
90 days to 11 November4,816
2026 so far (ENCLAI export)59,714
The card shows chikungunya in Brazil. It compares the last 30 days with the 30 days before, as reported to ENCLAI.
The card shows chikungunya in Brazil. 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

Chikungunya fever in Brazil: the 2026 picture · Chikungunya fever worldwide · Brazil: all diseases · How to read these counts

Retained reporting context

Included reporting countries

Chikungunya fever

4,907

combined reported surveillance count

2026-08-14 through 2026-11-11 · inclusive source-record dates

For Chikungunya fever, the combined reported surveillance count across the 10 countries with positive reported counts in this selection is 4,907. The selection uses source-record dates 2026-08-14 through 2026-11-11, inclusive. This covers only these reporting countries; source periods and completeness vary.

Exact included country membership
CountryReported countSource-record dates
Australia72026-08-14 through 2026-11-11
Brazil4,8162026-08-14 through 2026-11-11
Germany92026-08-14 through 2026-11-11
Spain32026-08-14 through 2026-11-11
Finland12026-08-14 through 2026-11-11
Hong Kong22026-08-14 through 2026-11-11
Panama12026-08-14 through 2026-11-11
Reunion12026-08-14 through 2026-11-11
Singapore12026-08-14 through 2026-11-11
United States662026-08-14 through 2026-11-11

Snapshot 2026-11-11

Weekly reporting history

Chikungunya fever

weekly reported-count series

Weeks starting 2026-08-03 through 2026-10-19

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
2026-08-03 through 2026-08-094
2026-08-10 through 2026-08-1616
2026-08-17 through 2026-08-2315
2026-08-24 through 2026-08-3014
2026-08-31 through 2026-09-06585
2026-09-07 through 2026-09-13223
2026-09-14 through 2026-09-20179
2026-09-21 through 2026-09-27100
2026-09-28 through 2026-10-0444
2026-10-05 through 2026-10-1158
2026-10-12 through 2026-10-181
2026-10-19 through 2026-10-252

Snapshot 2026-11-10

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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