Most cases are in China, but the outbreak has spread to more than a dozen countries, including the United States, which has six confirmed cases. She cited reports that the virus spreads from person to person and sometimes even before the infected person shows symptoms. States also have the authority to impose quarantines, but the federal authority has not been used in more than 50 years. Federal quarantine is used to restrict movement of people who were exposed to a contagious disease and prevent them from spreading to another state or outside the country. The travelers will receive regular temperature checks and medical care at the first onset of symptoms.

Source: Washington Post January 31, 2020 06:28 UTC