Aetna (NYSE: AET) opened at $40.54. So far today, the stock has hit a low of $38.45 and a high of $44.00. AET is now trading at $40.21, up $2.06 (5.4%). Over the last 52 weeks the stock has ranged from a low of $34.00 to a high of $60.00. Shares of AET are rising today with other health insurers after the U.S. government announced it will not increase Medicare premiums in 2009. Medicare premiums are now at...(Click the story link or go to http://www.marketintelligencecenter.com for the full story)