Austria has just published the results of their first representative study on about 1500 randomly selected people [1]. They found 0.33% infection rate (confidence interval 0.12% to 0.76%). While this figure is somewhat larger than the previously known numbers (still within the confidence band), it pretty much rules out that a large fraction of the population is already infected.
[1] https://www.sora.at/nc/news-presse/news/news-einzelansicht/n...