By Ben Tavener, Senior Contributing Reporter

RIO DE JANEIRO, BRAZIL – The United States’ biggest private medical company, UnitedHealth Group (UHG), and Amil Participações S.A., the biggest healthcare operator both in Brazil and Latin America, have agreed to merge, according to company statements. Minnesota-based UHG said it had reached an agreement to acquire a ninety percent stake in Amil at a cost of some US$4.9 billion.

If regulator approval in Brazil is given, UHG will buy the shares . . .

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