Environmental and Finished Dairy Product Sampling Monitoring for Listeria monocytogenes
1.5 Sampling

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There are various activities for Lm monitoring/verification in federally registered dairy establishments:

  1. Monitoring environmental sampling program (sampling plan D222). Its purpose is to monitor industry's effectiveness of sanitation and GMP in preventing contamination of cheese processing environments. Five to ten swabs are taken and composited for analysis.
  2. Domestic Cheese monitoring sampling plans (D207 & D221):
    • D207 - tests cheese for Listeria monocytogenes, E. coli count, S. aureus count, and Salmonella spp. as well as E. coli O157:H7 for products made from non-pasteurised milk.
    • D221 - performed at the same time as environmental sampling plan D222. Tests for Lm in cheese produced on the same packaging line where food contact surface sampling was done under plan D222.
  3. Directed environmental sampling program (sampling plan D212D). This biased environmental monitoring is performed to investigate or verify any suspected problems (i.e. poor GMP or new registrations) in dairy establishments. Lab analysis will include both Listeria monocytogenes and Salmonella spp.
  4. Other dairy products are sampled for Lm and various pathogens under specific sampling plans. Sampling plans that include Lm analysis: Domestic milk powders (D205), Imported dairy (D210), Fermented dairy (D217), Domestic butter (D218), Domestic fluid milk (D219) and Domestic acid & rennet coagulated dairy products (D220).
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