A cruise ship owned by Carnival Corp. was to remain in an Italian port with some 7,000 people on board until Friday, even after tests showed that a passenger who came down with fever and respiratory symptoms didn’t have coronavirus.

The Italian health ministry said late Thursday that two suspect cases tested negative to the disease. Carnival’s Italian unit Costa Crociere SpA had announced late morning that a 54-year old woman from Macau had been put in isolation on board its Costa Smeralda cruise ship in the port of Civitavecchia, near Rome.

Carnival Corp. shares (CCL) shares fell as much as 11% in London and traded down 4.3% at 2:02 p.m. in New York.

The World Health Organization on Thursday declared the coronavirus outbreak an international emergency, allowing global authorities to help countries with less robust health systems.

After the test results, port authorities said that the ship would remain in port overnight and passengers would be allowed to disembark early Friday morning. The hundreds of passengers waiting to get on board in Civitavecchia will spend the night in four-star hotels, the authority said via speaker-phones at the dock.

Tests showed that the two passengers had A/H1N1 flu, the health ministry said. The ship is not subject to any medical restrictions, according to a ministry statement late Thursday.

A medical team from a Rome hospital had examined the suspect patient on Thursday, who demonstrated fever and respiratory symptoms.

Prime Minister Giuseppe Conte told reporters during a visit to Bulgaria that Italy is adopting all measures to tackle risks linked to the virus, adding that “there is no need to spread alarmist information or to fuel any form of panic.”

“As soon as the suspected case emerged, medical staff on board immediately activated the necessary health procedures,” Costa Crociere said in a statement. “Our priority is to guarantee the health and safety of our guests and team.”

Italian media reported that passengers have been protesting the lockdown of the ship and lack of information.

Throughout the afternoon, the vessel was the only ship docked in the city’s port, with a limited security presence around it. Passengers were seen walking on the decks while empty buses waited below for an eventual disembarkation. Soft jazz could be heard playing on board during the day.

“There’s no panic, we only are very sorry we couldn’t see Rome this morning, especially that the weather is so beautiful,” Agata Wieczorek, 36, a Polish tourist on the cruise with her husband and three kids, said by phone.

The vessel was bound for La Spezia in the Liguria region, with 1,000 crew and 6,000 passengers, 750 of whom came from China, a port spokesman said. It will skip the next stage and will go directly to the Norther port of Savona once the lock-down is over.he necessary health procedures,” Costa Crociere said in a statement. “Our priority is to guarantee the health and safety of our guests and team.”

Italian media reported that passengers have been protesting the lockdown of the ship and lack of information.

“We don’t have information, no internet, because on the ship it doesn’t work,” Ansa new agency cited Italian passenger Liborio Iervolino as saying.

Cruise stocks have been slumping as analysts projected an earnings impact from coronavirus. Carnival and Royal Caribbean Cruises Ltd. previously suspended some cruises departing from China, a small but growing market for the U.S. companies.

Patrick Scholes, an analyst with SunTrust, said the Italian lockdown wouldn’t help.

“Even if it is a false alarm, the surrounding media attention is a negative for the propensity to book a cruise,” Scholes said Thursday by email. “Too early to quantify the financial impact from this latest news, but it’s safe to say that it will put pressure on earnings and investor sentiment.”

The vessel was bound for La Spezia in the Liguria region, with 1,000 crew and 6,000 passengers, 750 of whom came from China, a port spokesman said.