A Pakistani flood survivor Kalo Mai takes shelter on railway station in Multan, central Pakistan

UN Secretary-General Ban Ki-moon travelled to flood-ravaged Pakistan on Sunday to boost relief efforts as concerns grew about the 20 million people made homeless in one of the worst disasters to hit the country.

About 1,500 people have died in the disaster and more than 7.9 million acres of cotton, sugar cane and wheat crops have been destroyed.

The United Nations said the rate of diarrheal disease continued to increase among survivors. Cholera, which can spread rapidly after floods and other disasters, had also been detected in the northwest, where the floods first hit more than two weeks ago.

Nishat Welfare Organization has started a Medical at Bacho Band Qazi Ahmed with the help of expert doctors to cater the spread of epidemic diseases in the area.