The exact way the virus is spread is not fully known. And, it’s unclear how easily or sustainably 2019-nCoV is spreading between people.
With similar coronaviruses, person-to-person spread is thought to have happened mainly by respiratory droplets produced when an infected person coughs or sneezes — similar to how influenza and other viruses cause respiratory illness to spread.
Transmission may also occur when a person touches a surface or object that has virus on it and then touches his or her own mouth, nose, or possibly their eyes.
Because this is an emerging, rapidly evolving situation, new information about the transmissibility, severity, and other features associated with 2019-nCoV and investigations are ongoing.
More information from the CDC is here: https://www.cdc.gov/coronavirus/2019-ncov/about/transmission.html