Den kolera-epidemi, der har ramt Haiti i kølvandet af jordskælvet for godt et år siden, er langt mere omfattende, end de officielle tal fortæller, skriver BBC world news onsdag.
Rather than affecting a predicted 400.000 people, the diarrhoeal disease could strike nearly twice as many as this, latest estimates suggest.
Aid efforts will need ramping up, US researchers told The Lancet journal.
The World Health Organization says everything possible is being done to contain the disease and warns that modelling estimates can be inaccurate.
Before last year’s devastating earthquake on the Caribbean island, no cases of cholera had been seen on Haiti for more than a century.
The bacterial disease is spread from person-to-person through contaminated food and water.
