Dhaka, Nov. 4 -- nine of the 75 wards under Dhaka South City Corporation (DSCC) have been identified as high-risk zones for dengue, according to an Aedes larvae survey conducted by the city authorities.

DSCC Administrator Abdus Salam disclosed the findings at a press briefing at the Nagar Bhaban auditorium in the capital on Wednesday.

He said mosquito density was found above the benchmark in 57 wards, of which 29 were categorised as high-risk and 28 as medium-risk. The remaining 18 wards were put in the low-risk category.

The 12-day survey, held from September 27 to October 8, covered 2,250 houses, with 30 selected randomly from each ward.

Thirty-six field workers from DSCC and the Directorate General of Health Services took part, usi...