Hundreds of thousands of flood victims in makeshift camps across India and Nepal are facing the increasing threat of disease.
Several camps in India's northern Bihar state are already reporting cases of diarrhoea and linked illnesses. A huge area was devastated when a monsoon-swollen river burst its banks and changed course over the weekend.
A large part of Bihar remains under water, with 550,000 people displaced and a further 400,000 people still awaiting rescue.
According to the UN World Health Organisation, 3m people have been affected, while in southern Nepal at least 60,000 people have also had their homes washed away.
In many areas, wells have been inundated with floodwaters carrying silt, sewage, bodies and refuse.
'The important thing now is for there to be some camp management, where the people have access to latrines, clean drinking water and some basic health care,' said European Commission humanitarian aid representative Malini Morzaria.
At least 15 people drowned overnight in two separate accidents involving overcrowded rescue boats taking stranded villagers to safety.
The dead included many children who were washed away by the strong currents still gushing through Supaul and Madhepura districts, two of the worst-hit areas.
At least 100 people have been confirmed dead since the Kosi river overwhelmed decrepit flood defences in Nepal and shifted course two weeks ago.
The real toll is believed to be far higher as many people simply disappeared in the currents.
