Dozens of passengers on two voyages of the Royal Caribbean's Symphony of the Seas cruise ship tested positive for COVID-19 despite being negative when they boarded.

Of the 6,074 passengers and crew members aboard the Dec. 11 voyage, 44 tested positive for the virus, according to a USA Today report. One passenger from the Dec. 4 sailing tested positive for the omicron variant.

"Everyone [on the Dec. 11 trip] who tested positive is asymptomatic, and we continually monitored their health," Lyan Sierra-Caro, Royal Caribbean spokeswoman, told USA Today.

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Sierra-Caro said the Centers for Disease Control and Prevention notified the cruise line that a passenger on the Dec. 4 sailing had tested positive for the omicron variant.

The cruise line sent an email notifying guests on both voyages, as well as the current sailing aboard the Symphony of the Seas ship.

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All passengers were required to test negative prior to boarding. Those passengers ages 12 and older were required to be fully vaccinated.