Sickness event: Jan. 31, 2020
Certainty: Somewhat certain (4/5)
Notes: Date of illness onset may be Feb 1, based on personal messages. I didn't indicate any illness in messages on Jan 31, and went out that evening for dinner. Messages Feb 1 & 2 indicate I was feeling unwell or sick. A Feb 2 message described symptoms (and that others mentioned these, that it seemed viral): no fever, but stomach pain.