HOPEFULLY it's fine and this won't be A Thing https://www.sciencemediacentre.org/expert-reaction-to-people-being-re-tested-positive-for-coronavirus-after-initial-recovery-e-g-case-reported-in-japan-where-a-woman-has-been-confirmed-as-a-coronavirus-case-for-2nd-time/Assuming that there is a minimal possibility of misdiagnosis, it still remains unclear from the published reports whether the person involved was likely re-infected, or whether this represents an infection that may have been partially cleared or perhaps has gone latent. In either case, given the number of reported cases thus far, it would seem unlikely that this is a common occurrence, and thus should have only a small impact on the overall epidemic projections themselves. Of possibly greater concern are the implications for control measures – should quarantine periods be extended? It also makes contact tracing even more difficult, potentially straining resources.