* They had an outbreak in this village as a result of a festival event in mid-February
* A random sample of 1000 from a population of 12,000 were sampled afterwards
* The immunity within the population as a whole was at about 15%.
* The fatality rate was 0.37%
It's got this statement:
> By adhering to strict hygiene measures it is to be expected that the virus concentration of an infected individual can be reduced to the point that the illness manifests more mildly, with simultaneous development of an immunity.
But it seems like the that statement is just an assertion, not something specifically supported by the data they gathered in this study, because it goes on to say:
> These favourable conditions are not present in a superspreading event (e.g. Karneval meeting, apres-ski bar in Ischgl, Austria).