There's some shocking news for fast-food burger-lovers.
Almost all of the top 25 burger chains in the country failed the latest antibiotics report card.
22 got F's. Wendy's got a D-minus.
Only Shake Shack and Burger-Fi received an A on the National Resources Defense Council's report.
They were graded on whether they stopped or planned to stop using antibiotics in their beef, how well those plans were being implemented, and whether the company's claims about antibiotic use were true.
The consumer advocacy group NRDC says it saw positive changes by fast food restaurants after its past reports on antibiotic use in chicken so it decided to focus on beef this year.
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