Carnival Corp. said that it has limited exposure to unrest in Middle East and North Africa countries.

Beth Roberts, Carnival Corp.'s vice president of investor relations, said during Tuesday's third-quarter earnings call that less than 10% of cruise capacity across all brands would be in the eastern Mediterranean in 2013.

She said all Med deployments make up about 6% of Carnival itineraries in the first quarter, 17% in the second, 25% in the third and 28% in the fourth.

The average for the year is 19%, and Mediterranean capacity is split about equally between eastern and western routes, she said.

Carnival Chairman Micky Arison said Costa Cruises has a small ship in the Red Sea part of the year. "That could be an issue if this continues much longer," he said.

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