In the city of Dhaka, the number of dengue patients increases unusually at the end of the monsoons, when the Aedes mosquito and dengue fever infestation increases every year.
Dengue fever usually subsides with the onset of winter, as comparatively dry weather reduces the stagnation of clear water and also reduces the size of the Aedes breading.
According to the Ministry of Health’s control room, the data held in 41 city hospitals resembles a growing trend in the number of dengue patients.
The data says that at least 44 dengue patients were admitted to the hospitals by the third week of October, while the number was 70 in the last weeks of the month, 95 in the first week of November, and 99 in the first five days of the second week of the month .
Golam Mostafa Sarwar, deputy chief of health for Dhaka North City Corporation, said mosquito infestation increased in November due to late monsoon rainfall.
Entomologists said the infestation of the Aedes mosquito, the vector that transmits the virus that causes dengue, increases during the monsoons, that is, June through October, with frequent rains.
Kabirul Bashar, professor at Jahangirnagar University and vector management expert, said that although it was the time of the Culex mosquito spread, the change in rainfall in November led to the spread of the Aedes mosquito.
“Hopefully the dengue threat will decrease in winter as there is less or no rainfall,” he said.
In July 2019, 3,842 cases of dengue were reported, in August 2019 8,350, compared with just 23 in July 2020 and 64 in August 2020.