One thing to avoid is freaking out over stuff like “there are two reported cars where..” whatever.

When something happens a couple million times, then there are a couple “one in a million” occurrences.

So, sure, if one in ten thousand people could get it twice, then it has happened quite a few times already.

“Rare” means “rare”. In a large number of trials, it also means “certain to occur”.

immediate concern?

just got it for the second time.

If not, then it may be that there are different strains floating around out there that, while similar in symptoms, are different enough that the body's immune response doesn't recognize it as something that's been encountered before.

I'd say it's more likely that it's just a statistical outlier, though. As someone upthread pointed out, given enough occurrences, X is bound to happen. In the case of most pathogens, once you fight it off, you have immunity thereafter.

It was just reported that they were surprised that he got it for a second time.

after infection from other coronavirus'. This should be no different. But that's on average, there will be cases where an individuals immune system just doesn't, atleasg on the first go.

we should count on it at this time, until we know for sure, right now they are not sure of anything.

I wouldn't read too much into this one guy getting it twice, or even a small number of people getting it twice.

so you can take that chance but I am not yet willing to.

The immune system has "memory" and the next time it encounters the pathogen, it activates immediately, putting out antibodies and cytotoxic T lymphocytes.

This is how vaccines work.