Measles in Hong Kong: 2026 cases and outbreak reports
Reported measles surveillance for Hong Kong (HKG)
— ≈ Stable · 2025
— latest record 2026-09-29
What the 2026 data shows
As of 1 August 2026, Hong Kong has reported 9 measles cases in 2026, as published by Hong Kong CHP. The full year 2025 closed at 10 cases. The three-year baseline for Hong Kong is 11 cases a year. 2025 closed 6% below 3yr avg (WHO historical series), which is why the trend reads “≈ Stable”.
Of the 66 countries reporting measles to ENCLAI in 2026, Hong Kong accounts for 0.0% of reported cases and ranks 48 by case count.
ENCLAI has logged 9 surveillance records for measles in Hong Kong in 2026, with the most detailed reporting in Jul 2026 (7 records); the case counts run to 2026-08-01. 1 distinct surveillance sources reported this pair in 2026.
Reporting authorities for these counts: Hong Kong CHP
Key facts: Measles
Transmission
Airborne
Droplets and aerosols; contagious in air or on surfaces for up to 2 h. Infectious from 4 days before to 4 days after the rash.Plotkin's 8e · WHO 2026
Incubation
12.5 days (median)
95% CI 11.8–13.2; symptoms usually 7–14 days after exposure (range 7–18).Plotkin's 8e · WHO 2026 · Oxford Hb 2025
Vaccine
MCV, 2 doses · ≈95%
Live attenuated; dose 1 at 9 months where measles is common (12–15 months elsewhere), dose 2 at 15–18 months. Two-dose effectiveness ≈95% (95% CI 89–100).WHO 2026 · Plotkin's 8e
Cited reference facts about the disease, not derived from the surveillance counts on this page. Full set on the Measles page.
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Surveillance summary
2026 cases (YTD)
9
2025 cases (full year)
10
Baseline avg (3yr)
11
Trend (2025)
≈ Stable · 2025
-6% vs 3yr avg
Reported cases by year, Hong Kong
Year
Reported cases
Share of worldwide reports
2023
not reported
—
2024
not reported
—
2025
10
0.0%
2026 (year to date)
9
0.0%
Reporting bounds and case definitions vary; historical baselines are a separate comparison measure. Worldwide share compares this country's reported figure with the sum of all countries reporting measles to ENCLAI for that year. "Incomplete year" means our sources cover less than ten months of that year, so no full-year figure is shown; "outbreak total to date" is a running total since an outbreak began, not a count for one year.
Surveillance records logged in 2026
Month
Records
Reporting sources
Jul 2026
7
1
Aug 2026
1
1
Sep 2026
1
1
A record is one dated surveillance publication or one row of an official table; a month with many records is a month with detailed reporting, not necessarily more cases.
How many measles cases has Hong Kong reported in 2026?
As of 1 August 2026, Hong Kong has reported 9 measles cases in 2026, as published by Hong Kong CHP. The full year 2025 closed at 10 cases. The three-year baseline for Hong Kong is 11 cases a year. 2025 closed 6% below 3yr avg (WHO historical series), which is why the trend reads “≈ Stable”.
Is measles rising or falling in Hong Kong?
ENCLAI's trend reading for measles in Hong Kong is “≈ Stable · 2025”: the latest complete year is compared with the earlier baseline from the reported counts; the current year is not judged until it closes.
Where does Hong Kong publish measles surveillance data?
The counts on this page were published by Hong Kong CHP. ENCLAI compiles and normalises them and is not affiliated with these authorities.
About this data
Figures are reported case counts as published by the originating health authorities, compiled by ENCLAI from 444 verified surveillance sources. Hong Kong figures reflect the reporting available to ENCLAI; reporting periods and case definitions differ between sources, and a missing report does not establish zero cases.
ENCLAI holds measles records for Hong Kong dated from 2025.
How we verify and update data: methodology & Trust Center · understanding case counts.
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
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