By now you probably know quite well how much of the mass-produced meat in this country is laced with antibiotics, but we’re here with a list of the worst restaurant chain offenders.

A collaborative new report recently ranked the 25 largest US fast food and causal restaurant chains based on their policies and practices when it comes to antibiotics in their food. For the second year in a row, Panera Bread and Chipotle Mexican Grill were the only two chains to score an A grade.

The CDC estimates that at least two million Americans contract antibiotic-resistant infections every year. The American Academy of Pediatrics explained that the overuse of antibiotics in animals can make bacteria such as salmonella, E. coli and Campylobacter stronger and resistant to drugs that were previously able to ward them off.

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The following restaurant chains received F grades in antibiotic practices:

  1. KFC
  2. Dunkin’ Donuts
  3. Sonic
  4. Olive Garden
  5. Denny’s
  6. Starbucks
  7. Jack In The Box
  8. Burger King
  9. Applebees
  10. Domino’s Pizza
  11. Chilli’s
  12. Little Caesars
  13. Buffalo Wild Wings
  14. Dairy Queen
  15. Arby’s
  16. IHOP

This video talks about most of the restaurants that received an F in antibiotic practices: