This might be something to watch, Virus related..
SEOUL, Feb. 12 (Yonhap) – A total of 194 cases of norovirus infections have been confirmed as of Monday, since the outbreak in the Olympic host town last week, organizers of the PyeongChang Winter Olympics said.
http:// english.yonhapnews.co.kr/news/2018/02/12/0200000000AEN20180212004951320.html