BurgerFi and Shake Shack pass for antibiotic-free beef

A new report card is out for dozens of fast-food restaurants, and overall, most failed when it comes to serving antibiotic-free beef. Only two of the restaurant chains received an A grade for having no antibiotics in their beef. Those two included the up-and-coming chain BurgerFi and Shake Shack. The remaining top 22 burger chains failed to pass the test.