That's what media is telling us now. No offense but I start to doubt the reliability of information (and the virus screening in general). The German government has brought back some people from Wuhan by a military plane a few weeks ago. In the first place, media and politicians told the public there were no infected people on these planes. Later, when held in quarantine, some of these passengers were tested positively for Covid-19. As some people here correctly mentioned before: It is very hard to distinguish truth and facts from wild guessing and conspiracy, especially with regard to the news we get to see on TV or newspapers.
I don't mean to get political but I wonder if it's coincidence that during these days Germany's leading politicians are working hard to regulate and restrict the right of free speech on the internet, even though these laws certainly violate against European human rights and go way beyond anything imaginable in a democracy. As long as these hard restrictions are disguised under "actions against racism and hate speech" the majority of voters will support these approaches. With these tools in place, we will soon only get to know/see what they™ deem to be right for the public.