The Health Ministry warned of a possible dengue outbreak with on going monsoon rains.
Dengue has killed 70 people this year by yesterday.
A total of 46,896 dengue cases had been reported from all parts of the country by yesterday, Health Ministry sources said.
According to the Ministry, the high risk MOH divisions are located in seven districts.
They are Colombo, Gampaha, Kalutara, Galle, Matara, Ratnapura and Kegalle districts.
There is a significant increase in dengue deaths when comparing with the last year.
Only 58 persons died from dengue in 2018.