According to a statement issued Wednesday, the cruise line implemented an updated mask policy when the cases were reported.
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The exact number of positive cases was not immediately disclosed. The cruise ship departed out of Galveston.
"Our pre-established protocols of vaccinated guests and crew, testing, enhanced medical capabilities and contact tracing anticipated the potential for positive cases, and they are designed to adapt to various scenarios," read the statement. "We have identified and tested close contacts and anyone who tested positive is in isolation."
Carnival said its decision to implement the mask policy was made "in an abundance of caution."
The company said the cruise will continue as planned
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Meanwhile, Carnival said it will continue with vaccinated cruises as defined by the Centers for Disease Control and Prevention, which includes having a fully-vaccinated crew.
All guests, however, will be asked to wear masks in certain indoor areas of Carnival's ships.
The cruise line also added a pre-cruise testing requirement for all vaccinated guests.
More details on the cruise line's COVID protocols can be found on Carnival's website.
NOTE: The video above is from a previous ABC13 report published on July 5 detailing Carnival Vista's plans to keep passengers safe as the company prepared to return to cruising.