The number of people struck down by a virus causing vomiting and diarrhea at the Pyeongchang Winter Olympics has more than doubled to 86, though athletes remain unaffected, the Korean Centers for Disease Control and Prevention (KCDC) said.

One of the most hated short-term illnesses – which has been carving a swath of destruction through U.S. households in 2017 – is the norovirus, a gastrointestinal bug that has shut down schools and families across the United States.