Traceback evidence in an outbreak investigation can include which of the following?

• A. Common point of contamination in distribution chain from farm to fork, identified by reviewing records collected from restaurants or stores where sick people ate or shopped
• B. Inspections in food production facilities, on farms, and in restaurants that identify food safety risks
• C. Both A and B
• D. None of the above

Answer: (C)

Traceback evidence tracks the path of a contaminated product from source to consumer to locate where exposure occurred. Reviewing records from restaurants or stores where sick people ate or shopped helps pinpoint a common supplier, batch, or distribution link, which is the backbone of identifying the point in the farm-to-fork chain associated with the outbreak.

Inspections of food production facilities, farms, and restaurants identify safety risks and process weaknesses, such as sanitation lapses or improper temperature control. These findings can support and explain how contamination could have happened along the same trace path, offering context that strengthens the link back to a specific source.

Together, both reviewing distribution records and noting inspection findings provide a fuller picture of the traceback, making the combination the most informative evidence for an outbreak investigation.