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As far as not knowing whether folks can get re-infected. I think that they cannot

There is one case of a woman that did get reinfected, which sort of proves the general rule that they don't. Usually.

There are way more people who recovered only to find they continue to have problems long-term. I saw two health care workers on UCSF General Rounds (on YouTube) that took months to stop testing positive, and still are in lousy shape. The woman lost her sense of smell and three months later it's back but all she can smell is forest fire smell all the time! She says it's very hard to sleep with that. She's in an online "long haulers" group, and other victims tell her they have the same smell hallucinations.