The Carnival Magic cruise ship was en route back to the United States on Saturday with a passenger from Texas who might have handled specimens of the first Ebola patient diagnosed in the United States but is considered at low risk, a company spokeswoman said.The Dallas health care worker, who is said to have no symptoms and according to standards from the U.S. Centers for Disease Control and Prevention is at the end of the 21-day maximum incubation window for Ebola, had voluntarily gone into isolation along with a companion aboard the ship.The Carnival Magic cruise ship, owned by Carnival Cruise Lines, was expected to dock in Galveston, Texas, on Sunday, said Aly Bello-Cabreriza, a spokeswoman for the parent company Carnival Cruise Lines. Both Mexico and Belize refused to allow the ship to dock in their ports over Ebola concerns.The Texas Health Presbyterian Hospital worker did not have direct contact with now deceased Liberian patient Thomas Eric Duncan at the Dallas hospital but could have processed his bodily fluids 21 days ago, US officials said.The patient boarded the ship in Galveston on Oct. 12 for a seven-night cruise.The health care worker remained in self-quarantine and was not ill, Bello-Cabreriza said. "Regular debarkation will take place," she said. "The lab worker continues to show no symptoms."The hospital worker left the country before being notified of the CDC's updated requirement for active monitoring, U.S. government officials said on Friday.