Norovirus is spreading quickly in Pyeongchang with only a day to go until the Winter Olympics start.

The number of Olympics staffers who came down with food poisoning increased from 32 on Tuesday to 86 on Wednesday, the Korea Centers for Disease Control and Prevention said.

Among some 1,500 staffers who have been tested for norovirus after it was detected in their quarters, 1,102 tests have been completed. The virus has now also spread to Gangneung and Jeongseon, in addition to security staff quarters in Pyeongchang.