"The guest almost certainly did not contract COVID on our ship," the cruise line said in a statement regarding a passenger who died from COVID complications.
The cruise line said in a statement that it was "managing a small number of positive cases on board" but did not disclose the total number.
Florida Governor Ron DeSantis signed a bill into law in May that prohibited businesses operating in the state from requiring proof of COVID vaccination.
"We are thinking of and grieving with the families of the five passengers and our dear friend and pilot aboard the aircraft," said the company that owned the sightseeing plane.
"Effective June 29, 2021, unvaccinated guests 12 and older departing on a Royal Caribbean International cruise from Florida are required to purchase travel insurance," a spokesperson for Royal Carribean wrote to Newsweek.
"Guests eligible but not fully vaccinated or able to show proof of vaccination will be subject to testing and additional health protocols at their own expense," the company said. "Children not eligible for vaccines will be subject to complimentary testing and health protocols."
The maiden cruise of Odyssey of the Seas, the line's newest vessel, has been pushed back to July 31 "out of an abundance of caution."
The ship set sail from St. Maarten on June 5, in what was the first major cruise hosting Americans since the COVID-19 pandemic began.
The basking shark is the second-largest fish in the ocean, which can grow up to 39 feet long and weigh six tons.
While travelers will have a difficult time finding cruise ship voyages departing from the U.S, they can find trips in other regions of the world.
All volunteers must be at least 18 years old and be either fully vaccinated or provide documentation that they are not at high risk of severe COVID-19 illness.
"We're filing a lawsuit against the federal government and the CDC demanding that our cruise ship's be reopened immediately," the Florida governor said on Thursday.
In addition to its U.S. sailings through June, the cruise line also canceled its European cruises through September 18.
The CDC currently advises Americans to avoid cruise travel because "the risk of COVID-19 on cruise ships is very high."
COVID-19 vaccinations will be required on the upcoming sailings from the Bahamas and St. Maarten, the company said.
The crew members who tested positive were reported to be "doing well, with only mild symptoms," according to the ferry company.
The SeaDream Yacht Club vessel, which had 37 Americans aboard, returned to Barbados on Wednesday after the passenger tested positive.
The ship's itinerary hasn't changed following the tests.
The cruise began in Heraklion, the capital of the Greek island of Crete, and was due to sail to Piraeus, near Athens.
Hurtigruten's ship MS Roald Amundsen was one of the first cruise liners in the world to resume operations after they were halted amid the coronavirus pandemic.
A doctor on the Ruby Princess cruise ship allegedly told Josephine Roope that her friend had "only the flu, nothing to worry about."
Surface contamination can spread quickly, as a recent Japan Broadcast Corporation demonstration proves.
While Carnival Corporation confirmed it will "fully cooperate" with the investigation, Carnival Cruise Line announced it will resume voyages on eight ships from Miami, Port Canaveral and Galveston.
Among the ships are the Coral Princess, which announced Thursday that 12 people on board tested positive for COVID-19
As Carnival seeks $6 billion in funding to help with financial fallout caused by the COVID-19 pandemic, SEC filings on Monday showed that over 6,000 people were still sailing on ships owned by the company.
The cruise line has seen two of its ships report several confirmed cases of the COVID-19 virus since February.
"I'd rather have them stay on," Trump said Friday of people onboard a cruise ship where coronavirus was detected moored off the coast of San Francisco, "but I fully understand if they'd rather take them off."
Several major cruise lines—Royal Caribbean, Carnival, Celebrity Cruises and Crystal Cruises—have announced cancellations or changes to their itineraries for cruises in March and April.