The toll in Haiti from cholera has soared in recent days - with 3,333 people dead.
New figures show an increase of more than 400 deaths - including 100 on 19 December alone.
The average is about 50 a day.
Haiti's first cholera outbreak in more than a century has poured further misery on a poor and politically dysfunctional country trying to recover from a devastating January earthquake that killed some 250,000 people.
The epidemic, which began in October, spawned deadly anti-UN riots last month as some turned their anger on peacekeepers from Nepal accused of bringing the disease into the country.
Experts say the outbreak was likely sparked by a human source from outside the region and the United Nations has promised a thorough investigation into the origin of the epidemic.
Cholera, which causes potentially deadly cases of diarrhoea, often strikes in poor countries where there is a high danger of an epidemic due to inadequate sanitation and limited access to clean water.
The Pan-American Health Organisation in early December estimated Haiti could see up to 400,000 cholera cases over the next 12 months, half of them within three months alone.
