Health
Understand the patterns behind Sri Lanka’s reported dengue cases. Follow the latest reports, the weekly trend and the districts affected.
Reported cases this year
Report dated 12 Oct
Latest reported week
+0.6%
Week 40 · 2026
Most affected district
Gampaha · 21.1% of cases
Reported deaths
Year to week 40 · NDCU
Dengue cases by week
2026NDCU weekly surveillance
1,098
+93.0% vs same week last year
National Dengue Control Unit · Ministry of Health
Dengue surveillance
National & MOH indicators
Peak week
Highest weekly count
7,916
Week 27 · 2026
Concentration
Western Province share
46.9%
Colombo, Gampaha & Kalutara
MOH hotspot
Most cases this week
30
Biyagama · Unknown
Incidence
Highest per 100k
—
Biyagama · per 100,000
Coverage
Reporting districts
28
As of 12 Oct
Divisions
Tracked MOH areas
23
Medical Officer of Health divisions
Reported cases by district
Report dated 12 Oct
Largest 8 of 28 districts
102,769 island-wide cases
- 1.Gampaha21,700
- 2.Colombo20,023
- 3.Kandy8,003
- 4.Kalutara6,485
- 5.Matara6,359
- 6.Galle5,605
- 7.Ratnapura5,322
- 8.CMC4,140
National Dengue Control Unit · cumulative cases in current calendar year