More from NPR: The link between antibiotic-resistent bacteria and livestock practices

Today's Salt story (here) notes a large government study of supermarket meat samples.  It says:

The findings, released through the joint program of the Food and Drug Administration, the Department of Agriculture and the Centers for Disease Control and Prevention, got little attention when they were published in February. But this week, the Environmental Working Group, which opposes some of the livestock industry's use of antibiotics, analyzed the government data and highlighted some of their startling implications in a report.
 

The link for EWG's report is here.  It says

that government tests of raw supermarket meat published last February 5 detected antibiotic-resistant bacteria in:

 

Further, EWG notes,

 

Today, pharmaceuticals sold for use on food-producing animals amount to nearly 80 percent of the American antibiotics market, according to the Pew Campaign on Human Health and Industrial Farming.