Japan is suffering its first outbreak of pig cholera in more than 25 years, authorities said Sunday after culling more than 600 animals and suspending pork exports.

A farm in central Japan saw 80 pigs die last week after catching the highly-contagious disease, an agricultural ministry official told AFP.

Early tests showed negative results for classical swine fever, as the illness is officially known.

But the follow-up tests came out positive on Sunday, prompting the cull of all 610 pigs at the farm, he added.

"We are now processing the livestock there and disinfecting the farm," he said, adding that officials had set up sterilization points on access roads to the affected farm.

The government has set up a team of specialists to analyze possible infection routes, the agricultural ministry said in a statement.

Tokyo halted pork exports after the outbreak was confirmed. The nation sold roughly 9 million US dollars in raw pork meat to foreign markets last year.

Japan saw its last case of classical swine fever, which does not affect humans, in 1992.

The disease continues to rage in many parts of Asia, Europe, and Latin America.