At least 44 people aboard a Royal Caribbean Symphony of the Seas cruise ship have tested positive for COVID-19, the cruise line confirmed on Sunday. There were a total of 6,074 people on the 7-day cruise, 95% of whom were fully vaccinated against the virus. 

The ship left Miami on December 11and made stops in St. Maarten, St. Thomas, and Perfect Day at CocoCay before returning to Miami on Saturday. The cruise line said in a statement that all crew members are fully vaccinated against the virus.

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Royal Caribbean spokeswoman Lyan Sierra-Caro told USA Today that the cruise line notified passengers that an individual who sailed on that same ship earlier this month had tested positive for the omicron variant of coronavirus. 

“We were notified by the (Centers for Disease Control and Prevention) that a guest on board our (December) 4th cruise tested positive and it was identified as omicron. They (CDC) asked us to notify guests on the sailing — the one that ended today — and the current one,” Lyan Sierra-Caro told the outlet. 

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In the email to the passengers, the cruise line said, “This guest did not report symptoms to our onboard medical teams as outlined in our health protocols. Their post cruise test results were subsequently confirmed as the omicron variant.”

All those who have tested positive for COVID are asymptomatic and are being monitored. 

“Each person quickly went into quarantine. Everyone who tested positive was asymptomatic or had mild symptoms, and we continuously monitored their health,” Royal Caribbean said in a statement.