Experts blame global warming and rapid urbanisation for rising cases of dengue in South Asia

Dengue cases are on the rise again in South Asia - with infections surging during the monsoon season. What used to be a viral disease limited to the monsoon months, has now become a "year-round problem". Some experts warn it could become a "global" pandemic threat. Neha Poonia takes a look at what's making South Asia - and especially India's - dengue outbreaks more frequent, and more deadly.