Corona Virus contageous before Symptoms show

Incubation period is about 1-2 weeks.
Symptoms:

• 98% have fever
• 76% have cough
• 55% have shortness of breath
• (no sneezing symptom)

6 of the 41 sample patients died (no previous health concerns necessary).
source

First case of a person being infected from within Germany. The 33 year old received training at his company from a Chinese guest. The Chinese guest had a recent visit from her parents from Wuhan (now on lock down) in Shanghai. She traveled back to China on the 23rd and only noticed during her flight the symptoms (infecting the worker before symptoms showed). In China she was diagnosed, after which the company was contacted. 40 people in Germany, who were in contact with either the worker or the guest were told to remain home.
source
The virus is assumed to be transferred through liquids, hence it is advised to wash hands frequently (especially before touching your face), and wear facial mask when working around coughing co-workers if proximity cannot be avoided.

When coughing or sneezing do the vampire cough, which looks like dabing.

Your sleeve will filter most liquid particles you spew out.

UPDATE:
3 more got infected from the 2 mentioned above (colleagues). This is the first verified European Human to Human infection. source