The ship tried to dock in Belize, but the government wouldn't allow it. Mexico also turned the ship away. The cruise is now reportedly heading back to Texas.
The Centers for Disease Control and Prevention alerted the cruise operator on Wednesday that a guest on the ship was a lab supervisor at the hospital where Ebola patient Thomas Eric Duncan was treated.
Duncan contracted Ebola in Liberia and flew to the US for a visit before he started showing symptoms. He died in Texas last week.
The health worker on board the cruise ship is at very low risk for contracting Ebola and hasn't shown any symptoms. She is reportedly isolated in a cabin on board the ship.