The CDC confirmed that 2019-nCoV has spread between two people in the U.S. The latest patient is an Illinois resident with no history of travel to Wuhan, but shared a household with a patient diagnosed with the virus on January 21.

The new virus has been compared to MERS-CoV and SARS-CoV. The CDC says the process for evaluation and the PUI form to report suspected cases remains unchanged from the ones used with MERS-CoV, which was the virus of concern in 2015.