Dhaka, Nov. 9 -- Dengue fever, once a seasonal concern in Bangladesh, has now become a year-round health threat.

With cases and fatalities on the rise, many citizens are asking: if vaccines against dengue already exist, why hasn't Bangladesh started using them?

Experts say the answer lies in a mix of scientific limitations, regulatory caution, and complex public health considerations.

Entomologists note that climate change, rapid urbanisation, and poor waste management have expanded breeding grounds for Aedes mosquitoes, the carriers of the dengue virus. As a result, dengue is no longer confined to the rainy season but poses a continuous risk across the country.

According to public health specialist Professor Mushtaq Hossain, the Worl...