Nepalese troops thought to be source of disease that has killed 7,500 – more than violence that brought peacekeepers to HaitiHaiti is to call on the international community for more than $2bn (£1.25bn) to fight cholera amid growing evidence that UN peacekeepers started the world's worst epidemic.The government's 10-year plan to improve sanitation and water provision will be unveiled with the backing of foreign aid groups and the UN, which is accused of one of the greatest failures in the history of international intervention.It follows reports of a recent spike in cholera cases following hurricane Sandy and warnings from non-governmental organisation (NGOs) that the US and other big donors are cutting back on funding for disease control.A growing body of medical research identifies Nepalese peacekeepers as the source of the pathogen, which had been unheard of in Haiti for a century until the death in October 2010 of a villager who lived downstream of the UN camp in Mirebalais.Since then, cholera has spread along the river and into the slums of the capital, Port-au-Prince.