Passengers who were in lockdown on a cruise ship in Civitavecchia, the port servicing Rome, have now been allowed to leave after confirmation that two people on board do not have coronavirus. The Costa Smeralda with about 7,000 passengers and crew on board had been kept on the ship since Thursday morning after a 54-year-old Chinese woman from Macau came down with flu-like symptoms the previous night.

The woman, who boarded the ship on January 25 in the port of Savona, was placed in an isolation unit on the ship with her partner.

The Costa Smeralda had visited Marseilles in France and the Spanish ports of Barcelona and Palma de Mallorca this week before docking on Thursday at Civitavecchia.

The Costa Crociere cruise line said the 54-year-old woman and her partner, who has no symptoms, were immediately put into isolation Wednesday and the case reported to Italian maritime authorities.

Passengers were being kept on board Thursday pending checks to determine the type of virus. Passengers wearing face masks were seen on board the vessel.

“All the planned mechanisms were activated. Health authorities are on board, doing checks,” Italian Coast Guard Cmdr. Vincenzo Leone said at the port of Civitavecchia. “The situation is under control. There’s a security cordon on the dock.”

Italy’s health ministry subsequently confirmed that the two Chinese passengers tested negative for the virus and about 1,140 people who had been due to disembark at Civitavecchia early Thursday were finally allowed to do so. Costa Cruises offered to pay for their food and hotels.

The Costa Smeralda was to set sail again Friday, Italian media said.

Carnival Corp., which owns Costa Crociere, saw its stock price drop 11 percent Thursday morning.