The first case of coronavirus being spread by a person with no symptoms has been found
![Munich airport signs](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/01/013120_TI_coronavirus-germany_feat.jpg?fit=1028%2C579&ssl=1)
Signs in the Munich airport now warn travelers about the new coronavirus. Data from doctors charting contacts between coworkers in Germany who became ill with the virus suggest some people may spread it before they develop symptoms.
Sven Hoppe/picture-alliance/dpa/AP Images