First Union Corp.'s revelation that its credit card loss rates will remain unexpectedly high for the rest of the year has renewed analysts' worries about the health of bank card portfolios.

First Union, which has $6.4 billion of card loans, announced Monday that it had failed to sell $1.2 billion of high-risk receivables. As a result, its bank card chargeoff ratio will not decline from the 5.85% of the second quarter.

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