I have seen the word "Biphasic" used. It seems to mean that the infection subsides and resurges later. I think discharge criteria have been looked at in light of this.Oh dear.
From the Vallodolid Daily.
81 year old lady who was taken into hospital a few weeks ago, one of the first on the mailnland, was discharged as full recovered. Videos were shown of the staff cheering as she left and she was giving thumbs up and shouting "champions".
She died 36 hours later. No official reason for death but relatives claiming it was coronavirus.