Great news from Korea ( Thanks to J Sigmo noting this earlier )
Executive summary: Korea re-tested some who had SARS-Cov-19 after recovery and they re-tested positive. Turns out the test detected RNA fragments from the virus and the people were not infectious!
This is great news.
"After several reports of COVID 19 reinfections or "re-positives" (a positive test, followed by a negative test, followed by a positive test), there have been lingering questions: Does a COVID-19 infection provide immunity? Is it possible to get the new coronavirus twice? New data from the Korean CDC sheds light on this question and Dr. Seheult illustrates how RT-PCR COVID-19 testing works and what may be happening when a person appears to be reinfected. Also, the first SARS-CoV-2 antigen test has been approved by the FDA. (This video was recorded on May 20, 2020)"