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Aid workers have been stunned by the scale of devastation in Burma

Survivors of the Burma cyclone are bracing themselves for further torrential rain.

Storm warnings have been issued for the region despite large swathes of the country still lying submerged under putrid floodwater from the initial cyclone.

The Burma government has come under sustained international pressure as aid agencies warn the death toll following the cyclone could reach 1.5 million.

Further heavy deluges will hamper the progression of embryonic aid efforts which are only now starting to reach the more remote areas.

Oxfam said the stricken country faces a public health catastrophe unless clean water and sanitation are quickly provided.

Save the Children spokeswoman Kathryn Rawe said huge storms were expected to strike Burma.

Speaking from Thailand she said: "Storm warnings have been issued to last until May 15. It is feared that a month's worth of rain could fall in just two days.

"The storms are not expected to be on the same scale as the cyclone, but it's going to make bad conditions 100 times worse.

"People already displaced by the previous cyclone are going to be left without any shelter."

She said that up to 5,000 square kilometres of the country still lay under water.