Coventry rivals fall after its profit warning

NEW YORK (Reuters) - Shares of health insurers Aetna (AET.N: Quote, Profile, Research) fell 10.8 percent, UnitedHealth Group Inc (UNH.N: Quote, Profile, Research) dropped 8.4 percent, WellPoint Inc (WLP.N: Quote, Profile, Research) sank 7 percent after rival Coventry Health Care (CVH.N: Quote, Profile, Research) slashed its second-quarter profit forecast nearly in half and cut its 2008 view.