The number has risen sharply this year. But the latest figures also show something else: September is running at a much slower pace than the months that pushed the outbreak towards the 100,000 mark.
Sri Lanka is less than 1,600 cases away from a six-figure dengue total for the year.
The latest figure reported by News 1st on Friday was 98,427 cases. Seventy-four dengue-related deaths have been recorded. The National Dengue Control Unit’s own live dashboard currently shows 98,249 cases, reflecting the way the surveillance figures are being updated as new notifications come in.
There is another number worth watching.
That works out at about 162 cases a day. July, by comparison, produced almost 30,000 cases in a single month.
The fall in the monthly pace is significant, but it is too early to treat it as the end of the outbreak. Dengue transmission in Sri Lanka follows seasonal patterns, and health authorities are still carrying out mosquito-control work in areas where larvae have been found.
Western Province remains the centre
The national figure also hides a strong geographical concentration.
Western Province accounted for 51,426 cases by September 13, or 52.67 percent of the country’s cases at that point. Gampaha had recorded 20,742 and Colombo 19,235.
Those numbers are not unusual in the country’s dengue statistics. The National Dengue Control Unit says Colombo, Gampaha and Kalutara have consistently carried the highest burden, citing population density, urbanisation, construction and conditions that allow mosquitoes to breed.
The government has been running a special mosquito-control campaign across 62 Medical Officer of Health divisions from September 14. The programme targets areas where dengue mosquito larvae have been found.
The NDCU currently lists 35 high-risk MOH areas under intensified surveillance.
The number to watch now
If the September pace continues at roughly the same level reported during the first 17 days, the 100,000 mark would be reached soon. That is a simple arithmetic projection, not an official forecast, and daily case notifications do not move in a straight line.
What is clearer is the distance Sri Lanka has already travelled this year.
The country’s largest recorded dengue outbreak was in 2017, when more than 186,000 cases were reported. The 2026 total is nowhere near that figure yet, but it has already become a major public-health event.
For the health authorities, the immediate task is therefore a fairly practical one: keep the September decline going while preventing rainfall and new breeding sites from pushing the numbers back up.
