The UN has allocated $2m (£1.5m) to help tackle a cholera outbreak in the north-east of Nigeria.
At least 50 people have been killed by the disease since the end of March.
There have been more than 400 confirmed cases in Yobe state, where many people live in overcrowded conditions having fled their homes because of the Boko Haram insurgency.
The funds from the UN will help provide safe water for more than 1.6 million people and improve sanitation in the affected communities.
But the UN said more resources were needed especially now rainy season had set in and the risk of outbreaks and spreading of water-borne diseases was higher.