The number of confirmed coronavirus cases keeps rising. As of Saturday, there were 11,791 cases in China, and an eighth case was confirmed in the United States.

U.S. officials on Friday declared the coronavirus outbreak a public health emergency.

As a result of the declaration, foreign nationals who have traveled to China in the last two weeks and aren’t immediate family members of U.S. citizens or permanent residents will be temporarily banned from entering the U.S., according to Health and Human Services Secretary Alex Azar. Azar also announced that anyone entering the U.S. who has been in China’s Hubei province in the last two weeks will be subject to a two-week quarantine. 

Earlier Friday, U.S. health officials issued a federal quarantine order for the 195 Americans evacuated from Wuhan, the epicenter of the outbreak. The group will remain at a military base in Southern California until mid-February, said Dr. Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases. The government hasn’t issued such a quarantine order in over 50 years, Messonnier said.

The State Department has warned Americans to avoid all travel to China due to the “rapidly spreading” outbreak. The decision came after the World Health Organization designated the outbreak a global public health emergency.

As of Saturday, the flu-like virus had killed at least 259 people, all of them in China.