#SARSCoV2 hospitalizations and deaths are rising fast across Europe and politicians face the difficult task to find measures that work while minimizing disruption. People will use tracing statistics to argue for or against measures. But bear in mind that these are biased.

The @rki_de publishes a fairly detailed breakdown of known transmission settings and households account for a big chunk.

But households are among the easiest to trace, while public transport, shopping, etc are essentially impossible.

Whether transmission in restaurants, bars, private gatherings, etc are captured likely depends a lot on the test-and-trace strategy and effort.

While household transmissions are important and easy to trace, they are also very hard to prevent. And every household transmission starts with an infection outside the household. Don't use this as an argument for inaction.

At the same time, we know many factors that facilitate #SARSCoV2 transmission:

* high density
* indoors
* poor ventilation
* loud speaking and singing

These factors are likely better guidance than tracing statistics (at least in many countries).