HOUSTON — A supplier of cookie dough that Blue Bell Creameries blamed for a possible listeria contamination of some of its ice cream said Thursday that its product tested negative for the pathogen before it was sent to the Texas-based company.

Blue Bell announced Wednesday it was recalling select flavors of ice cream distributed across the South and made at its Sylacauga, Alabama, plant after finding chocolate chip cookie dough from a third-party supplier — Iowa-based Aspen Hills Inc. — that was potentially contaminated with listeria. Blue Bell said Thursday evening in an email it stood by its test results that

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