Italian study funds 73.9% asymptomatic rate for those under 60

Yes, apparently they think post-infection immunity might only last about 3 or so months. But my expectation then is that if you didn't have symptoms the first time, you probably wouldn't have much of an effect on you the next time, either. And if you are pretty much constantly in contact with it, your immune system would be continually updated.

It does seem like people who have had it should not avoid contact with the virus thereafter, in order to maintain that immunity. But I'm not an epidemiologist. So I could easily be completely wrong. Barking mad, even.