LONDON (Standard&Poor's) Nov. 25, 2009--Standard&Poor's Ratings Services said today that it assigned its 'BB+' long-term debt rating to the $75 million series I, class E principal-at-risk variable-rate notes due Jan. 15, 2014, which were issued on Nov. 23, 2009, by Cayman Islands-based Vita Capital IV Ltd. The notes will provide Swiss Reinsurance Company Ltd. (Swiss Re; A+/Stable/A-1) with a degree of protection against extreme mortality events occurring to specified age and gender distributions in the U.S. and the U.K. Swiss Re has previously securitized mortality risk through the Vita Capital Ltd., Vita Capital II Ltd., and Vita Capital III Ltd. transactions. The Vita II transaction is scheduled to expire at the end of 2009 and the