Health workers spray disinfectants in a residential area as part of a dengue control program in Colombo, Sri Lanka, on June 6, 2025. A total of 6,042 cases of dengue was reported from Sri Lanka in May, the latest data by the National Dengue Control Unit (NDCU) shows. The data also indicates a steady increase in dengue cases over the past three months, with 3,766 cases reported in March and 5,166 cases in April.(Photo by Gayan Sameera/Xinhua)

COLOMBO, June 5 (Xinhua) -- A total of 6,042 cases of dengue was reported from Sri Lanka in May, the latest data by the National Dengue Control Unit (NDCU) shows.

The data also indicates a steady increase in dengue cases over the past three months, with 3,766 cases reported in March and 5,166 cases in April.

In the first five months of this year, 23,744 dengue cases have been reported. Most cases have been reported in Colombo, Gampaha, Ratnapura, and Batticaloa districts.

So far, 13 people have died from dengue over the first five months of 2025, the NDCU data shows.

Health officials warn that the number of dengue cases is likely to rise further with the onset of the monsoon rains. ■

Health workers spray disinfectants in a residential area as part of a dengue control program in Colombo, Sri Lanka, on June 6, 2025. A total of 6,042 cases of dengue was reported from Sri Lanka in May, the latest data by the National Dengue Control Unit (NDCU) shows.

The data also indicates a steady increase in dengue cases over the past three months, with 3,766 cases reported in March and 5,166 cases in April.

(Photo by Gayan Sameera/Xinhua)

A health worker sprays disinfectants in a residential area as part of a dengue control program in Colombo, Sri Lanka, on June 6, 2025. A total of 6,042 cases of dengue was reported from Sri Lanka in May, the latest data by the National Dengue Control Unit (NDCU) shows.

The data also indicates a steady increase in dengue cases over the past three months, with 3,766 cases reported in March and 5,166 cases in April.

(Photo by Gayan Sameera/Xinhua)

Health workers inspect mosquito breeding grounds in a residential area as part of a dengue eradication program in Colombo, Sri Lanka, on June 6, 2025. A total of 6,042 cases of dengue was reported from Sri Lanka in May, the latest data by the National Dengue Control Unit (NDCU) shows.

The data also indicates a steady increase in dengue cases over the past three months, with 3,766 cases reported in March and 5,166 cases in April.

(Photo by Gayan Sameera/Xinhua)