IIRC
some of the first cases that happened in Germany were asymptomatic transfer
Chronology of the virus in Bavaria
January 16: A Chinese employee of the Webasto company received a visit in Shanghai from her parents from the Wuhan region, which is severely affected by the coronavirus.
January 19-23rd: The woman then visited the Webasto company in Stockdorf, Bavaria. She showed no symptoms of illness and took part in a seminar on January 21st, together with a 33-year-old Webasto employee from nearby Kaufering. Another Chinese employee, who would later be diagnosed with an infection, is also said to have been present at meetings.
January 24th: The otherwise healthy man suffered from a sore throat, chills and muscle aches. The following day he came down with a 39.1 degree C fever and a persistent cough.
January 26th: The Chinese woman tested positive for the coronavirus. The 33-year-old man, however, felt better in the evening and headed back to work the following day.
January 27th: The Chinese woman informed the company about her illness.
The man from Kaufering then tested positive, marking the first case of coronavirus in Germany, and first human-to-human transmission in Europe.
READ ALSO: German coronavirus patient is first case of human-to-human transmission in Europe
January 28th: Tests showed that a 27-year-old and a 40-year-old man as well as a 33-year-old woman had also become infected. All three worked at Webasto. One of the infected had contact with the Chinese woman, the others with the 33-year-old man from Kaufering.
January 30th: Late in the evening it was revealed that another Webasto employee from Siegsdorf had become infected. He had flu-like symptoms, as did his wife and three children aged between six months and five years.
https://www.thelocal.de/20200205/coronavirus-in-bavaria-how-did-the-virus-spread
all day!