Santa Clara County, California, confirmed the second case of the novel coronavirus, the Santa Clara County public health department said Sunday.

This second case of the virus is in an adult female, the public health department said in a statement. The newest case is unrelated to the first case but both individuals recently traveled to Wuhan, China, the department said.

The newest patient arrived January 23 to visit family in Santa Clara County, public health officials said.

“She has stayed home since she arrived, except for two times to seek outpatient medical care. She has been regularly monitored and was never sick enough to be hospitalized,” the statement said.

There have been four cases of the coronavirus in California.