[gewa]

That is just not true. There were a few number of cases, where a second test was positive after initial curing. This is being investigated and can be attributed to issues with the test, false positive diagnosis in the first place or various individual reasons. There is no evidence for a fundamental issue with adapted immunity to Sars-CoV-2.

[therealmarv]

You forget something. Maybe after first curing people get immunity and can get the virus again but it does not get active and test gets positive. People can have viruses and antivirus or a non active virus without consequences and then the test will be positive.