Political turmoil in Haiti is hampering the country's fight against a cholera outbreak that has killed thousands since October.

A November 28 presidential election has been marred by widespread allegations of fraud that threatens to put the country in a state of deadlock.

Meanwhile, the UN Secretary General has appealed for more international aid help to combat Haiti's cholera outbreak and says the disease could affect more than 600,000 more Haitians over the next six months.

But as Sebastian Walker reports from Port-au-Prince, the capital.