Life-threatening malaria and diarrhoea have been spreading in Nyarugusu, the world's third largest refugee camp, since the rainy season began, and damage caused by a powerful El Nino has left aid agencies short of funds throughout east Africa.
"Refugees are arriving in their hundreds every day," the agencies, which include Oxfam, Save the Children and HelpAge International, said in a statement.
"Many people are still living in overcrowded mass shelters months after their arrival, where wet floors and cramped conditions mean that the risk of respiratory infections and waterborne diseases is high."
