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I’m curious why you’re optimistic about sterilizing immunity (though i don’t love the term). I’ve been optimistic as well, but a lot of cold water thrown the last couple weeks and I’m struggling to articulate the optimism.
Let me clarify - I *chose* to be optimistic 
. Many compare SARS-2 immunity to common cold bCoVs, but I don't think we can do that-very different infections. For SARS and MERS we don't understand immunity, but I haven't heard of a SARS reinfection and SARS-2, much more like that
Neutralizing antibodies to SARS and MERS will decline after a couple/few years so lasts much longer than CC CoVs - not lifelong, mind you, but longer. Do those nAbs lead to sterilizing immunity? Dunno, but not unreasonable to think. So I go with that until proven otherwise 
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I’m with you. Plus nAbs titers aside, memory B cells+T cells, I think there’s immunity there. Entirely sterilizing I don’t know, but I’d be very very surprised if there was no protection.
Okay I think we’re on a similar page! SARS didn’t ultimately cause so many infections to be fair, but certainly now even a single documented re-infection would be front page news, and there’s no news.
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