Yeah they’ve seen that in China - people testing negative then positive. I don’t know how much is testing error and how much is the virus - all four of my presumed Covid patients had a very weird up-and-down recovery; feeling really good one day, then way back down the next, off and on for a 2-3 weeks. It’s like their body is wrestling with the virus, some days they’re on top, some days it’s got them in a chokehold again. It’s really weird and definitely unlike any other virus I’ve ever seen.
