Joint letter by Keep Antibiotics Working coalition members to FDA regarding virginiamycin/distillers grains petition. KAW comments on the Ferm Solutions, Inc. Food Additive Petition (Animal Use) for Virginiamycin, Docket No. FDA–2010–F–0510. The FermSolutions petition asks that the Food and Drug Administration(FDA) approve the feeding of distiller grains, a by-product of ethanol production, to food producing animals even when the distiller grains contain the medically important antibiotic virginiamycin