It's actually suspected that the whole epidemic in Europe originated from the first confirmed infection in Germany. A woman from Shanghai who had a business trip with her car manufacturer. That same manufacturer happens to have a factory in northern Italy.

Some Italian scientists did an RNA analysis on samples from infected people from Italy, and confirmed they descended from the first German case.

Basically, if this hypothesis is true then German quarantine and/or exposure tracking failed. Had they played it safe and properly quarantined the entire staff of the office building , Europe's coronavirus pandemic might have gone entirely differently.