(Bloomberg) -- Aetna Inc.’s $37 billion deal to buy rival insurer Humana Inc. was blocked by a federal judge, thwarting one of two large mergers that would reshape the U.S. health-care landscape. Aetna said it was considering an appeal.

The transaction would violate antitrust laws by reducing competition among insurers, U.S. District Judge John D. Bates in Washington ruled on Monday. Under the terms of the merger agreement, Aetna owes Humana a $1 billion breakup fee.

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