A week after ConAgra Foods Inc. recalled peanut butter after a salmonella outbreak, the Centers for Disease Control and Prevention confirmed the presence of the dangerous germ.

ConAgra Foods Inc. last week recalled all Peter Pan and Great Value peanut butter made at its Sylvester, Ga., plant after federal officials linked the product to a salmonella outbreak that has sickened at least 329 people from 41 states since August.

Officials have said the contamination may have been caused by dirty jars or equipment. Shoppers are asked to toss out jars having a product code beginning with “2111.”