The current outbreak of 2019 novel coronavirus (2019-nCoV) originated in China but has now spread internationally, impacting an increasing number of countries. Sustained community spread is occurring in China. Limited person-to-person spread, most associated with close contact with a patient with confirmed 2019-nCoV has been seen outside of China. No community spread of 2019-nCoV has been identified in the United States at this time. In the coming days and weeks, we expect more confirmed cases in the United States, including some person-to-person spread. The goal of CDCs aggressive ongoing public health response is to prevent spread of 2019-nCoV in in the United States.