Credit deterioration for U.S. CDOs was almost wholly contained to U.S. dollar-denominated resecuritizations in 2007, according to a recent study by Moody’s Investors Service. Moody's downgraded a total of 1,331 tranches of U.S. dollar-denominated resecuritizations in 2007, which accounted for 92% of the 1,448 downgrade actions for all CDOs during the year.

Not surprising, downgrades were primarily concentrated in the 2006 and 2007 vintages, making up 87% of the 1,448 total downgrades.

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