A study describes the data transmitted to backend servers by the Google/Apple based contact tracing (GAEN) apps in use in Germany, Italy, Switzerland, Austria, and Denmark and finds that the health authority client apps are generally well-behaved from a privacy point of view, although the Irish, Polish, Danish, and Latvian apps could be improved in this respect. However, the study also finds that the Google Play Services component of the apps contacts Google servers as often as every 20 minutes…