https://twitter.com/ballouxfrancois/status/1410723099528421380
So there is prior immunity and an immune reaction to exposure without getting infected
I didn't read what was shared, but it's possible this is just a curiosity until we know:
1. Could they spread curiosity further?
2. Does this immune response protect them in any way from subsequent (full-blown) infections.
If the answer to both these questions is no, then how does matter at all?
This could be the same as any other virus, where I'm guessing that if someone is exposed to a small enough amount of the virus (one cell, low viral load, I don't know the scientific term), then the body immediately fights that off and the patient never becomes infected.