The index case imported from abroad in the second group involved Patient #5, a 32-year-old man from Wuhan who visited Korea on January 24th and started to develop aches similar to that observed in the common cold on January 26th. Patient #9, who developed a secondary infection, was an acquaintance of Patient #5 who stayed and dined at the same place as Patient #9 until January 29th. Patient #9 developed a headache on January 30th, was managed as a contact case, and tested positive on January 31st.