UPDATE 3-U.S. blocks health insurer Aetna's $34 bln Humana acquisition

Jan 23 (Reuters) - A U.S. judge blocked on Monday health

insurer Aetna Inc's proposed $34 billion acquisition of

smaller peer Humana Inc, raising the stakes for rival

Anthem Inc as it battles to close a $54 billion deal to

buy Cigna Corp.

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