The emergency ward at the main government hospital in Sehwan, a small town in southern Pakistan, is overwhelmed.

On a recent visit, a reporter witnessed hundreds of people crammed into rooms and corridors, desperately seeking treatment for malaria and other illnesses that are spreading fast after the country's worst floods in decades.

Amid the crush, Naveed Ahmed, a young doctor in the emergency response department of the Abdullah Shah Institute of Health Sciences, is surrounded by five or six people trying to get his attention.