MODULAR COMPOSITING-MULTIPLE LOT SCREENING PROTOCOLS FOR DETECTION OF PATHOGENS, MICROBIAL CONTAMINANTS AND/OR CONSTITUENTS

• US 20140370517A1
• Filed: 08/28/2014
• Published: 12/18/2014
• Est. Priority Date: 08/06/2004
• Status: Active Grant

• Current Assignee: Institute for Environmental Health, Inc.
• Original Assignee: Institute for Environmental Health, Inc.
• Inventors: Samadpour, Mansour
• Granted Patent: US 9,637,771 B2
• Time in Patent Office: Days
• US Class Current: 435/6.15
• CPC Class Codes: C12Q 1/04 Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor C12Q1/6897 takes precedence
• CPC Class Codes: C12Q 1/10 Enterobacteria
• CPC Class Codes: C12Q 1/18 Testing for antimicrobial activity of a material
• CPC Class Codes: C12Q 1/24 Methods of sampling, or inoculating or spreading a sample; Methods of physically isolating an intact microorganisms
• CPC Class Codes: G01N 1/28 Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Qmounting specimens on microscopic slides G02B21/34; means for supporting the objects or the materials to be analysed in electron microscopes H01J37/20 ; laboratory gas handling apparatus B01L5/00
• CPC Class Codes: Y10S 435/849 Escherichia coli

Abstract

Particular aspects provide a method of sampling, testing and validating test lots (e.g., single-unit production lots), comprising: assembling a plurality of product portions from each of a plurality of test lots and combining the collected product portions to provide a corresponding set of test lot samples (wherein each test lot sample is attributed to a particular corresponding test lot); enriching the set of test lot samples; removing equal portions of each enriched sample, and combining the removed portions to provide a modular composite sample; and testing of the modular composite sample for the target agent/organism, wherein where such testing is positive, individual test lots may nonetheless yet be validated by further testing of a respective enriched test lot sample and obtaining a negative test result. The methods have broad utility for monitoring all sorts of test lots (e.g., environmental lots, production lots, pharmaceutical lots, etc.) and for efficiently affecting informed, targeted remedial measures.

Claims

1. A method of sampling and testing products for microbes in multiple separate lots, comprising:

a) separately collecting multiple independent samples from each of multiple separate lots, wherein each separate lot is separately sampled by taking said multiple independent samples thereof;

b) separately compositing the collected multiple independent samples from each of the separate lots to provide a corresponding set of separate composited lot samples, wherein each of the separate composited lot samples is attributed to a particular corresponding separate lot;

c) enriching each of the separate composited lot samples to provide a set of separate composited lot samples enriched for the target microbe(s);

d) removing portions of each separate enriched composited lot sample, and combining the removed portions to provide a pooled modular composite sample; and

e) testing of the pooled modular composite sample, using a suitable detection assay, for the target microbe(s), wherein when such testing is negative all of said samples that were composited to form the separate composited lot samples are deemed negative for the target microbe(s) and each of the multiple separate lots is validated, and wherein when such testing is positive, each of the individual separate composited lot samples that were used to form the pooled modular composite sample are individually tested to determine which of the separate composited lot samples is positive for the target microbe(s), wherein the lots corresponding to any negatively testing composited lot samples are validated.

2. The method of claim 1, wherein each of the multiple separate lots is selected from the group consisting of an environmental lot comprising multiple operationally-linked environmental specimens, pharmaceutical lot comprising multiple operationally-linked pharmaceutical specimens, single product lot comprising multiple operationally-linked product specimens, and combinations thereof.

3. The method of claim 1, wherein each of the multiple separate lots is a single production lot, comprised of operationally-linked product specimens.

4. The method of claim 3, wherein product specimens are synonymous with product portions.

5. The method of claim 1, further comprising incubating the pooled modular composite sample of d), prior to testing in e).

6. The method of claim 1, wherein each separate composited lot sample in c) comprises incubating each separate composited lot sample with enrichment medium suitable to enrich for the target microbe(s), and wherein removing in d) comprises removing a portion of the enrichment medium from each enriched separate composited lot sample and combining the removed portions to provide a pooled modular composite sample.

7. The method of claim 1, wherein testing of the pooled modular composite sample, using a suitable detection assay comprises use of a concentration step to concentrate the target microbe(s).

8. The method of claim 1, wherein where testing in e) of the pooled modular composite sample is positive, and wherein the separate individual composited lot samples are further tested using a more sensitive protocol.

9. The method of claim 8, wherein the more sensitive protocol comprises use of a concentration step to concentrate the target microbe(s), in combination with the same test protocol used to test the pooled modular composite sample.

10. The method of claim 1, further comprising, forming an additional pooled modular composite sample from the set of enriched separate composited lot samples of c) and testing the additional pooled modular composite sample, using the same or a different suitable assay, to confirm the testing status.

11. The method of claim 1, further comprising, forming an additional pooled modular composite sample from an additional enriched separate composited lot sample along with any enriched separate composited lot samples of c) that test negative in e), and testing the additional pooled modular composite sample, using the same or a different suitable assay.

12. The method of claim 1, further comprising, where testing of the pooled modular composite sample in e) is negative, forming an additional pooled modular composite sample from the set of enriched separate composited test lot samples of c), and testing the additional pooled modular composite sample, using a different suitable assay, to confirm the negative testing status.

13. The method of claim 1, wherein each of the lots is selected from the lot group consisting of a single combo, single bin, single pallet, and a production assemblage.

14. The method of claim 1, wherein the number of separate lots is from 3 to 10.

15. The method of claim 1, further comprising, where testing of the pooled modular composite sample is positive, determining which individual separate lots are positive, application of remedial measures to said separate positive lots, and validating by further testing of the respective remediated separate lots and obtaining a negative test result.

16. The method of claim 1, wherein, in a), separately collecting said multiple independent samples from each of the multiple separate lots comprises separately collecting from each separate lot a number of samples from 5 to 100.

17. The method of claim 1, wherein, in a), separately collecting said multiple independent samples from each of the multiple separate lots comprises separately collecting 30 to 60 samples from each separate lot.

18. The method of claim 1, wherein, in a), separately collecting said multiple independent samples from each of the multiple separate lots comprises separately collecting at least 30 samples from each separate lot.

19. The method of claim 1, wherein, in a), separately collecting said multiple independent samples from each of the multiple separate lots comprises separately collecting at least 60 samples from each separate lot.

21. The method of claim 1, wherein removing portions in step d) is removing equal portions, aseptically, so as to preclude contamination of the enriched separate composited lot samples.

23. The method of claim 1, wherein the target microbe(s) comprises at least one selected from the group consisting of Listeria, Salmonella and Escherichia coli.

24. The method of claim 1, wherein the target microbe(s) comprises at least one selected from the group consisting of Listeria spp., Listeria monocytogenes, Salmonella spp., Escherichia coli O157:

H7, coliforms and fecal coliforms.

25. The method of claim 1, wherein the target microbe(s) comprises a spoilage organism.

26. The method of claim 1, wherein removing portions of each separate enriched composited lot sample comprises removing equal volume portions of each separate enriched composited lot sample.

27. The method of claim 1, wherein testing of the pooled modular composite sample, using a suitable detection assay comprises use of at least one of a DNA-based method, an immunochemistry-based method, and a biosensor-based method.

28. The method of claim 7 wherein the concentration step comprises at least one of immunomagnetic bead separation, and affinity chromatography.

29. The method of claim 1, wherein each of the multiple separate lots are production lots of a meat or poultry product, comprising an assemblage of one or more meat or poultry specimens, respectively.

30. The method of claim 29, wherein the meat or poultry specimens are meat trim pieces or poultry trim pieces, respectively.

31. The method of claim 29, wherein the meat is that of beef, pork, sheep or bison.

32. The method of claim 1, wherein each of the multiple separate lots are separate production lots of a fish or seafood product, comprising an assemblage of one or more fish or seafood specimens, respectively.

33. The method of claim 1, wherein each of the multiple separate lots are separate production lots of a ready-to-eat product.

34. The method of claim 6, wherein the enrichment medium comprises a selective agent that will inhibit a competing non-target microbe.

35. The method of claim 1, further comprising in (e) wherein when such testing of the modular composite sample is negative, nonetheless testing each of the separate composited lot samples for the target microbe(s) to enhance confidence in the negative testing results prior to deeming the lots validated or releasable into the chain of commerce.

36. The method of claim 1, further comprising, in (e) wherein when such testing of the pooled modular composite sample is positive, each of the individual separate composited lot samples that were used to form the pooled modular composite sample are individually tested to determine which of the separate composited lot samples is positive for the target microbe(s), retesting of the separate negatively testing composited lot samples to enhance confidence in the negative testing results prior to deeming the lots corresponding to the negatively testing composited lot samples validated or releasable into the chain of commerce.

20. A method of sampling and testing products for microbe(s) in multiple separate lots, comprising:

a) separately collecting multiple independent samples from each of multiple separate single production lots, wherein each separate single production lot is separately sampled by taking said multiple independent samples thereof;

b) separately compositing the collected multiple independent samples from each of the separate lots to provide a corresponding set of separate composited single production lot samples, wherein each of the separate composited single production lot samples is attributed to a particular corresponding separate single production lot;

c) enriching of the separate composited single production lot samples to provide a set of separate composited single production lot samples enriched for the target microbe(s);

d) removing portions of each separate enriched composited single production lot sample, and combining the removed portions to provide a pooled modular composite sample; and

e) testing of the pooled modular composite sample, using a suitable detection assay, for the target microbe(s), wherein when such testing is negative all of said samples that were composited to form the separate composited single production lot samples are deemed negative for the target microbe(s) and each of the multiple separate single production lots is validated, and wherein when such testing is positive, each of the individual separate composited single production lot samples that were used to form the pooled modular composite sample are individually tested to determine which of the separate composited single production lot samples is positive for the target microbe(s), wherein the single production lots corresponding to any negatively testing composited single production lot samples are validated.

22. The method of claim 20, wherein removing portions in step d) is removing equal portions, aseptically, so as to preclude contamination of the enriched separate composited single production lot samples.

37. The method of claim 20, further comprising in (e) wherein when such testing of the pooled modular composite sample is negative, nonetheless testing each of the separate composited single production lot samples for the target microbe(s) to enhance confidence in the negative testing results prior to deeming the single production lots validated or releasable for processing or into the chain of commerce.

38. The method of claim 20, further comprising, in (e) wherein when such testing of the modular composite sample is positive, each of the individual separate composited single production lot samples that were used to form the pooled modular composite sample are individually tested to determine which of the separate composited single production lot samples is positive for the target microbe(s), retesting of the separate negatively testing composited single production lot samples to enhance confidence in the negative testing results prior to deeming the single production lots corresponding to the negatively testing composited single production lot samples validated or releasable into the chain of commerce.