According to Reuters, the organization said in a report released on 20 September that one backyard farm in Anse-à-Pitre, near Haiti's border with the Dominican Republic, suffered an outbreak that began on 26 August.
In July, the US Department of Agriculture confirmed African swine fever in samples from pigs in the Dominican Republic, the region's first case in nearly 40 years. The agency at the time warned that Haiti was at a high risk for infections.
The USDA confirmed Haiti's outbreak last week through testing at its Foreign Animal Disease Diagnostic Laboratory on Plum Island in New York, the OIE said. The USDA is expected to issue a statement on the matter.
Haiti is conducting surveillance for the disease in pigs and imposed a quarantine to control the outbreak, the OIE said.
Cases in Haiti and the Dominican Republic raise concerns that African swine fever could spread to the United States and temporarily hurt US pork exports. Governments often block imports of pork products from countries where the disease has been found to prevent transmission.
African swine fever is harmless to humans but often fatal to pigs. It originated in Africa before spreading to Europe and Asia and has already killed hundreds of millions of pigs, while reshaping global meat and feed markets.
The disease spread rapidly in China starting three years ago and wiped out half the country's hog herd, the world's largest, within a year. It sent global pork prices surging.
In Haiti, the outbreak is the latest challenge for residents and the government following an earthquake and the assassination of the president.