Health-care overhaul pushes stocks higher By: MarketWatch January 15, 2010 at 17:00 PM EST Some 91% of health-care companies in S&P 500 are within 10% of 52-week highs. Read More >> Related Stocks: Aetna AmerisourceBergen Corp Baxter International Biogen Idec Cigna Corp DENTSPLY International DaVita HealthCare Partner Hospira Humana Johnson & Johnson Laboratory Corp American Holdings Merck & Co PattersonCompanies PerkinElmer Pfizer Stryker Corp Thermo Fisher Scientific UnitedHealth Group Varian Medical Systems Waters Corp Zimmer Holdings