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Sanderson Farms has run ads defending its use of antibiotics but will now stop using an antibiotic called gentamicin to keep chicks healthy and another called virginiamycin in its feed.

The Chicago-based chicken producer changed the language on its website after questions from Reuters about its use of virginiamycin, an antibiotic included in a class considered "highly important" to fighting infections in humans.

At the time, Koch said it has no plans to discontinue the use of virginiamycin, which it says may be used to prevent a common intestinal infection in chicken.

Detectable amounts of five antibiotics were found in the seafood samples: oxytetracycline in wild shrimp, farmed tilapia, farmed salmon and farmed trout; 4-epioxytetracycline in farmed salmon; sulfadimethoxine in farmed shrimp; ormetoprim in farmed salmon; and virginiamycin in farmed salmon that had been marketed as antibiotic-free.

Even fish marketed as antibiotic-free wasn’t off the hook: researchers found virginiamycin in one sample of farmed salmon bearing the label.