(EMAILWIRE.COM, March 20, 2010 ) Dallas, TX - Following were among the healthcare companies whose shares were actively traded in Friday’s session.

Pfizer Inc. (NYSE:PFE) went down 1.86% to $16.91. In the last one year of trading sessions the stock prices has jumped over 16%.

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Halozyme Therapeutics, Inc. (NASDAQ:HALO) went up 5.92% to $8.05 on 2.13 million shares. The stock today made its new 52-week high of $8.24.

Merck & Co., Inc. (NYSE:MRK) decreased 1.01% to $38.06 on 30.78 million shares. Merck & Co., Inc. is a global health care company that delivers health solutions through its medicines, vaccines, biologic therapies, and consumer and animal products, which it markets directly and through its joint ventures.

UnitedHealth Group Inc. (NYSE:UNH) soared 2.38% to $34.39 on 21.83 million shares.

Generex Biotechnology Corporation (NASDAQ:GNBT) lost 8.03% to $0.552 on 8.93 volume shares. The stock is up over 45% in the last one year of trading sessions.

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