As part of its enforcement activities, the Food and Drug Administration sends warning letters to entities under its jurisdiction. Some letters are not posted for public view until weeks or months after they are sent. Business owners have 15 days to respond to FDA warning letters. Warning letters often are not issued until a company has been given months to years to correct problems.

The FDA has issued warning letters to four food and pet food operations for violations involving Listeria monocytogenes in a cheesecake facility, Salmonella in raw dog food, inadequate HACCP controls for live oysters and repeated failures to verify imported seafood meets U.S. safety standards.

Failure by these firms to correct the violations may result in seizure, injunction, registration suspension, refusal of entry or other enforcement actions.