'We estimate that 40 per cent of the hardest-hit people are children' said Veronique Taveau, spokeswoman of the United Nations agency for children.

The agency estimates that one million children need 'urgent assistance'.

'Due to the destruction of homes and schools, children are sleeping on the streets, in the schools which are still standing or in monasteries, often without shelter from rain', said Taveau.

This is a situation that 'contributes to an increased risk in diseases but also ...to abuse, exploitation and risks of all kinds', she added.

Reuniting children with their parents or relatives is a Unicef priority.

'In a single township, we counted 500 isolated children, and the number could be higher,' she said.

The agency is arranging radio broadcasts to aid reunification efforts.

Unicef also fears that the most vulnerable families which have no access to emergency aid could 'be tempted to sell their children or make them work', said Taveau.

On Tuesday, aid groups had also warned that traffickers are targeting youngsters in crowded camps.

'Unaccompanied children are at risk of injuries, abuse and trafficking,' Unicef's chief child protection officer in Myanmar, Anne-Claire Dufay, told reporters then.

Cholera cases
Some cholera has been confirmed among survivors of Cyclone Nargis, but the number was in line with case levels in previous years in Myanmar, the World Health Organisation (WHO) said.

'We do have some confirmed cholera,' Ms Maureen Birmingham, acting WHO representative in Thailand, said of the hardest-hit Irrawaddy delta where cholera is endemic.

'We don't have an explosion of cholera. Thus far the rate of cholera is no greater than the background rate that we would be seeing in Myanmar during this season,' she told reporters on Friday.

A network was still being set up to monitor for diseases among 2.5 million people severely affected by the cyclone which tore through the delta two weeks ago, she said.

Diarrhoea, dysentery and skin infections have afflicted some cyclone refugees crammed into monasteries, schools and other temporary shelters after the devastating May 2 storm.

The first sign of cholera, which is spread by drinking contaminated dirty water, is 'rice water' diarrhoea leading to chronic dehydration and possibly death within a few hours.

Without treatment, it can spread rapidly through populations of displaced people and kill as many as one in two victims.

The WHO has sent emergency health kits to the devastated region and was providing bleach and chlorine tablets to treat dirty water.

Corpses are still rotting along the banks of the Irrawaddy river two weeks after the disaster which killed up to 128,000, but the WHO said they pose no risk to public health.

'There has never been a documented case of a post-natural disaster epidemic that could be traced to dead bodies,' the WHO said in a statement.

It said the peak danger period is between 10 days and one month after a natural disaster due to the heightened threat of unsafe food, dirty water and poor hygiene and sanitation in overcrowded shelters.

'It is how the survivors are managed, rather than how the dead are managed, that determines if and when an epidemic may occur,' the WHO said. -- REUTERS, AFP