But it probably won’t.

Via Washington Examiner:

The first case of the deadly Ebola virus has been diagnosed in the United States, the Centers for Disease Control and Prevention announced Tuesday, saying that a man who flew back to the U.S. from Liberia tested positive for the disease.

The unnamed Ebola patient did not report symptoms of the virus until after entering the U.S. on Sept. 20 and did not get sick until after being in the country for four days, according to CDC Director Tom Frieden.

“I have no doubt that we will control this case of Ebola so that it does not spread,” Frieden pledged during a Tuesday evening press conference.

The CDC chief said that officials were not concerned that passengers on the plane ride from Liberia to the U.S. were at risk of contracting the virus because Ebola can’t spread until after symptoms show up.

“It is only spread by direct contact with somebody,” Frieden said. “It’s only someone who is sick with Ebola who can spread the disease.”