Because you don’t get immunity, does not mean it lays dormant and can be reactivated. Two different things.
I understand that. I’m not saying CV goes dormant. I’m speculating that in the “relapse” cases, after the lungs are cleared and patient tests neg, the patients must still have the infection in other areas, maybe organs, muscles, etc.
I think it’s unlikely they were re-exposed and re-infected, especially since some were still isolating alone at home like the most recent case in Japan.