The Carnival cruise ship carrying a Dallas health worker who quarantined herself after possibly being exposed to Ebola docked in Galveston, Texas, early Sunday morning.

The Centers for Disease Control and Prevention realized that the unidentified lab supervisor at Texas Health Presbyterian Hospital could have come into contact with Ebola after she handled a lab specimen from Thomas Eric Duncan, the first person diagnosed with Ebola in the United States, who later succumbed to the disease.

The woman boarded the cruise ship Carnival Magic on Oct. 12, before two other Dallas health care workers who had helped treat Duncan were diagnosed with Ebola. She does not have any Ebola symptoms and it has now been 21 days since she could have had contact with the disease, which is the maximum amount of time it generally takes for Ebola symptoms to develop.

U.S. government officials wanted her to exit the ship in Belize for further monitoring, but Belize’s prime minister did not permit it. The ship was also not allowed to dock at a port in Mexico, and other parts of the trip were canceled.

Officials aboard the cruise ship reportedly took their time to inform people onboard that one of their fellow passengers had volunteered to quarantine herself due to possible Ebola exposure, but the new information didn’t prevent passengers from carrying on with their normal cruise routines.

Three people in the U.S. have so far been infected by Ebola. The two nurses who helped treat Duncan are themselves being treated at hospitals in Georgia and Maryland.

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