I was released from the hospital today. And I had covid back in June. I've been tested twice since then. Both negative. I was referred to in the hospital as a double negative. The consensus being I was unlikely to be infected again. With that being said one of the reasons I was in the hospital is the covid whacked out my heart's electrical system, causing an irregular heartbeat.
So I gather reinfection can occur but would be rare. However, the covid can cause lingering health issues long after it is no longer present in the body.