Sri Lanka battles surge in dengue fever, with more than 44,000 cases so far this year

COLOMBO – Sri Lanka is battling the worst outbreak of mosquito-borne dengue fever in years, with more than 44,000 cases and 28 deaths recorded since January, an official said on June 19, putting public hospitals under strain.

Dengue is common during Sri Lanka’s monsoon season, but unplanned urbanisation coupled with damage caused by Cyclone Ditwah, which hit the island nation in late November, has worsened the outbreak in 2026, the authorities said.

The number of dengue cases jumped from 5,651 in April to 10,638 in the first two weeks of June, according to data from the National Dengue Control Unit (NDCU).

“We noticed this increase after the cyclone,” Prashila Samaraweera, consultant community physician and NDCU spokeswoman, told Reuters.

“A lot of debris was in our environment, so we noticed a lot of mosquito breeding places, and our entomological indices were high from that time.”

With 51,000 cases recorded in the whole of 2025, the rate of infections has risen sharply, Samaraweera said, and infections are likely to increase for at least two more weeks before tapering off.

A further uptick in patient numbers could put public hospitals under severe strain, Sri Lanka’s Health Minister Nalinda Jayatissa warned on June 18.

More than half the cases are from the western region of the country, including 9,429 cases from commercial capital Colombo. Eight other districts have reported over 2,000 patients since the start of 2026.

The 28 deaths include five children.

Patient numbers for 2026 could end up matching the last major outbreak in 2019, the authorities have warned, when Sri Lanka recorded more than 105,000 dengue patients.

Schools, homes, construction sites and public buildings are being cleaned up during a special programme launched by Sri Lanka’s health authorities and other public officials until June 22. REUTERS