At least four dengue patients died and 1558 others were hospitalised in the past 24 hours, according to health ministry data, marking the highest daily admission tally recorded in 2026.
The disease, which can cause fever, severe headaches and potentially fatal complications, has spread sharply in recent weeks, reviving concerns after Bangladesh's deadliest dengue outbreak in 2023.
The outbreak has further strained a healthcare system already grappling with a nationwide measles outbreak that has killed nearly 1000 children this year.
Health experts warn September could prove even more severe than August, which recorded the highest monthly dengue caseload of the year.
Professor Kabirul Bashar, a medical entomologist at Jahangirnagar University, said his surveillance and forecasting model suggests hospitalisations could exceed 30,000 this month if current trends continue, with weather conditions likely to support transmission into October.
"The peak has not been reached yet," Bashar said.
"If the current trajectory continues, September may become the worst month of the year for dengue infections."
Dengue patients can deteriorate rapidly after their fever subsides, developing complications such as plasma leakage, low blood pressure, shock and severe bleeding, making close monitoring during the critical post-fever phase essential.
"Patients are flooding hospitals, and warning signs such as abdominal pain, dizziness and unusual lethargy must not be ignored," said Professor Tarek Alam, a physician treating dengue patients in Dhaka.
The spread of Aedes mosquitoes beyond Dhaka and other major cities was fuelling infections in districts and rural areas. Dengue cases have now been reported in all 64 districts, although the capital continues to account for the largest share.
The government has intensified prevention efforts as the outbreak worsens. Prime Minister Tarique Rahman has ordered nationwide cleanup and awareness campaigns, urging people to remove stagnant water and other mosquito-breeding sites while encouraging greater community participation in mosquito-control measures.
