U.S. credit card defaults surged to a record in August as unemployment rose to the highest level in a quarter century, Fitch Ratings said Thursday.

Writeoffs for loans deemed uncollectible climbed to 11.52%, compared with 10.55% in July, according to Fitch's Prime Credit Card Chargeoff Index. Loans at least 30 days delinquent, an indicator of future losses, "remained elevated" at around 5.5%, Fitch said.

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