Warren Buffett is helping revive shares of beleaguered UnitedHealthcare Group after taking a $1.6 billion stake in the company, according to filings with the Securities and Exchange Commission.UnitedHealth shares are on pace for the best one-day percentage gain since 2008, as tracked by Dow Jones Market Data Group. Still, the stock is down more than 50% over the past 12 months. Investors, taking a cue from Buffett’s interest in healthcare, also piled into Vanguard Health Care Index Fund ETF Shares and The Health Care Select Sector SPDR Fund.DOJ PROBES UNITEDHEATLHCARE GROUPBuffett's Berkshire...

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