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Dow stocks Pfizer and UnitedHealth could be safety plays amid market volatility

Keris Lahiff

In a wild week for the Dow , one corner of the index has proven immune to the worst of the volatility: health care. Dow stocks Pfizer PFE , UnitedHealth UNH and Merck MRK remain within reach of 52-week highs, while the Dow hangs 5 percent from its own.