Are you following the CFIA listeria policy to the letter? And did you have the sample re-tested to confirm the species?
https://www.canada.c...ocytogenes.html
https://inspection.c...nocytogenes#a71
You really do need to send your product out for testing, you NEED to know if it is present in the food and not just your facility (or not).
7.1 Food Contact Surface samples positive for
Listeria
7.1.1 Examples of corrective actions
- Intensify and increase the cleaning and sanitation of the equipment and the processing environment
- Equipment disassembly and cleaning
- On-site observations and/or employee interviews to determine whether sanitation and operational procedures are being adhered to. Employee re-training if necessary
- Review previous weekly and monthly results for both the food and environmental samples to determine trends that could identify a possible source or reason for positive result(s)
- Consult with your supplier to determine if the detergents and sanitizers being used are appropriate (concentration, contact time, water temperature) and which alternates may be applied
- Review sources and controls for raw materials and ingredients, or imported foods
- Address equipment or facility design flaws that may be an obstruction and not allow for an adequate cleaning and sanitation
- Review the process flow and plant floor diagram to ensure that the potential for cross-contamination is controlled (for example the restrictions of employees flow or establishment of sanitary zones)
- Review the sanitation program to determine if anything has changed, such as new staff, different cleaning chemicals or new cleaning equipment being used
Verify the effectiveness of corrective actions in accordance with figures 2 and 3 of the HC Listeria Policy.
7.1.2 Persistent contamination
If two or more FCS samples from the same production line (for example: using the same equipment) are found positive for Listeria within a short timeframe, this is considered persistent contamination and an indication that the sanitation procedures or Listeria control measures are inadequate.
As indicated in the HC Listeria Policy, section 7.2.1.1, what constitutes a "short" timeframe is operation-specific and will vary based on factors such as production volume, production seasonality and testing frequency. It should be considered that persistent contamination exists when an increase in the rate of FCS contamination is observed in the establishment's trend analysis.
In these situations it is recommended to:
- Implement corrective actions as suggested in section 7.1.1
- Verify the effectiveness of corrective actions in accordance with figures 2 and 3 of the HC Listeria Policy. Note corrective actions are only considered effective when the results for FCS and RTE food samples are negative for 3 or more consecutive days of production
- Inform the CFIA when L. monocytogenes is detected in a food sample
- Identify:
- the foods that may be affected
- how many days of production since the last negative result
- the status on inventory and product distribution for the production period in question
- the shipping information for traceability of affected product