Some 1-hundred 72 people have been exposed to contact with the 55-year-old South Korean man who was confirmed Monday as the fourth patient.
This is according to the Korea Centers for Disease Control and Prevention.
Since his infection was confirmed, the KCDC had been looking into who he might have come into contact with, and on Tuesday it has released the results.
The investigation mainly focused on the cities of Incheon and Pyeongtaek, where he lives.
The man first went to a hospital in Pyeongtaek for cold-like symptoms last Tuesday, the day after he returned from Wuhan on the 20th.
He went back home after being diagnosed with a cold, only to revisit the hospital on Saturday as the symptoms worsened.
On Sunday, he was reported to the public health center and was sent for screening.
After that, based on the information gathered by the KCDC, the man stayed mostly at home or at the hospital.
However, 95 people came into close contact with him, most of them those who were with him on the plane, the airport bus or in the hospital.
There are also his family members, among whom there was one suspected case that later tested negative.
The others are keeping themselves isolated and are under active monitoring by the health authorities.
And the places he's been, including the airport, bus and hospital, have been disinfected.
Based on the latest update from the KCDC, this is where the numbers now stand in South Korea:
"As 10 AM on January 28th, the total number of patients under investigation stands at 1-hundred-16. Among them, 4 cases have been confirmed while 15 are being tested, and 97 people have been discharged after testing negative."
While all the confirmed patients are still being treated a 35-year-old Chinese woman and a 55-year-old South Korean the first and second, are reportedly in a stable condition.
The third patient, a 54-year-old South Korean, has also been undergoing treatment in isolation since Saturday.
Lee Kyung-eun, Arirang News.