The graphs look chilling. A red line sharply shooting north, crossing a purple, a yellow, a blue and a green. “That's what dengue looks like this year,” said Dr Ayesha Akhter, in-charge of disease control room at the directorate of health, pointing to the red line representing the number of patients this year.

After a few months of relative relief, a large part of Dhaka South City Corporation is again at risk of suffering a dengue outbreak, a survey found. Out of the 2,599 buildings and construction sites they visited to conduct the survey, officials found Aedes larvae in 938, thus raising the concern.