More than 3,000 cases of cholera have now been confirmed and 14 people have died from the disease.
More than 3,100 of the cases are in the northeastern provinces of Kirkuk and Sulaymaniah where the outbreak first emerged in August. However, the infections were now reported in nine out of 18 provinces, the WHO said.
"The case-fatality rate has remained low throughout the outbreak indicating that those who have become sick have been able to access adequate treatment on time," WHO said.
"The disease is continuing to spread across Iraq and dissemination to as yet unaffected areas remains highly possible," it added.
Though the numbers of cases are stable in Basra, Baghdad, Dahuk, Mosul and Tikrit, a new case has now been confirmed in Wasit, a province that has previously been unaffected by the outbreak.
The WHO also reported that Diyala, a province neighboring Baghdad, has an increasing number of cases of acute watery diarrhea. Though no confirmed cases of cholera are found but the symptoms indicate the presence of the infection that can soon lead to full-blown symptoms.
Cholera is a gastrointestinal disease that is typically spread by drinking contaminated water and can cause severe diarrhea. In extreme cases, it can lead to fatal dehydration.
"WHO is in the process of procuring 5 million water-treatment tablets, and two international WHO epidemiologists are being deployed to support the Ministry of Health in Iraq," it said.
