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(Corrects headline and paragraph 1 to say Carnival warned it might post a loss, not forecast a loss)
March 25 (Reuters) - Carnival Corp, the world's largest cruise operator, barely broke even on an adjusted per-share basis in the first quarter and warned it might post a loss for the current quarter due to a rise in costs.
The company, which operates the Carnival, Holland America and Costa cruise lines, reported a net loss of $15 million, or 2 cents per share, for the first quarter ended Feb. 28 compared with a profit of $37 million, or 5 cents per share, a year earlier.
Revenue fell marginally to $3.58 billion. (Reporting by Shailaja Sharma in Bangalore; Editing by Kirti Pandey)