Late to respond to this.
I agree with you that it was likely a norovirus. Everything else you said is wrong except that you can't play through it. It is likely that the majority of cases are contracted through contaminated food (from a food handler coming back to work too soon after illness, usually). There are also multiple serotypes, so you can get infected over and over again. Even serotype-specific immunity is not lifelong. So one infection is not even remotely protective.
So, pretty much there is nothing good about norovirus. Some people are naturally almost completely immune to it, though, which is nice. Degree of susceptibility actually has to do with your blood type. Those who are blood type O are more likely to get infected, and/or more likely to have symptomatic infection. Researchers are hard at work at making a vaccine for it; it's still a long ways off, but if it works, that could be a great, great thing.
I now return you to your regular thread.