South Korea has confirmed an additional cholera infection, raising the official number of people with the waterborne virus to four, health authorities said Saturday.

A man in his 40s, a Busan resident, has been diagnosed with the disease after eating seafood at a local restaurant earlier this week, shortly after he returned from a trip to the Philippines, they said. He traveled to the Southeast Asian nation with two other Busan residents.

He is now receiving treatment at a Busan hospital, while his wife and other family members have shown no unusual symptoms.

A fish market on Thursday in Geoje, South Gyeongsang Province, where authorities have begun carrying out quarantine activities to prevent the spread of cholera. (Yonhap)