An Ebola victim has flown in from Liberia and has now been placed in an isolation ward at a Dallas hospital.
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“This individual left Liberia on the 19th of September, arrived in the U.S. on the 20th of September [and] had no symptoms when departing Liberia or when entering this country,” said Tom Frieden, director of the Centers for Disease Control and Prevention.

The victim began having symptoms by the Sept. 25, and was admitted on Sept. 28 to the hospital.

That three-day period with symptoms is critical because Ebola can only be transmitted when the victim is having obvious flu-like symptoms.

Frieden indicated the individual could have passed the disease to Americans from Sept. 25-28. Officials are now checking if anyone else begins to show symptoms, and they can be identified and isolated.