May 4/Washington/Chicago Tribune -- Tyson Foods has 14 days to dismantle a national multimillion-dollar ad campaign centered on the claim that its chickens are raised without antibiotics, a federal appeals court in Richmond, Va., has ruled.

Tyson will have to remove posters and brochures from 8,500 stores nationwide.

Sanderson Farms and Perdue Farms had jointly sought an injunction to stop Tyson's ad campaign, arguing the "raised without antibiotics" claim misleads consumers by making it appear Tyson's chicken is safer or more healthful.

From the May 12, 2008, Prepared Foods e-Flash