For all the worry over the growing threat of superbugs resistant to drugs and the role of antibiotic use in animals, there’s surprisingly little information about what goes into our food when we eat out.

Walk down the meat aisle at any grocery store and you’ll see packages labeled with information about antibiotic use, but when it comes to restaurants it’s often impossible to differentiate between those that use meat treated with antibiotics and those that ban it.

In what is believed to be the first report of its kind, a group of environmental and consumer advocacy organizations has graded 25 of the largest fast-food and fast-casual chains in the United States on their use of antibiotics and their transparency about it.

The researchers surveyed the companies and reviewed their public statements to create scorecards for each restaurant chain.

Only two companies — Chipotle and Panera — got top marks.