"It (the outbreak) already has a regional dynamic and the risk of that can only be increased by people from all over the region coming into Iraq," Unicef country director, Peter Hawkins, said on Thursday. "Kuwait, Bahrain and Syria have already had confirmed cases."
Millions of Shi'ite Muslims are due to visit Iraq in December for Arbaeen, a religious ritual marking the end of an annual mourning period for the Prophet Mohammad's grandson Hussein, whose death in 680 AD entrenched the schism between Shiites and Sunnis.
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The war against Islamic State militants who control large swathes of territory in northern and western Iraq has also contributed to the outbreak. The conflict has displaced more than three million people, with many living in camps where conditions are conducive to the spread of cholera - a bite of contaminated food or a sip of contaminated water is enough to cause infection.
Hawkins said Unicef has only limited access to areas controlled by Islamic State, which swept across the Syrian border in mid-2014 in a bid to establish a modern caliphate.
Higher military expenditure and other costs associated with the battle against Islamist militancy has aggravated a cash crunch for Iraq, a major Organization of the Petroleum Exporting Countries oil producer that has suffered from the drop in global crude prices over the past year. A higher proportion of the government budget is also being spent on security.
One in five of the confirmed cases in Iraq is among children, and in large parts of the country the start of the school year was delayed by a month as a precaution, Unicef said in a statement.