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TECHNICAL QUESTIONS AND CONCERNS
EXPERT REVIEW PANEL FOR MICROBIOLOGY FOR FOODS AND ENVIRONMENTAL SURFACES
1. If a company wants to claim multiple test portion sizes of more than one matrix, what are the
requirements for PTM AND OMA testing?
Example: The method developer wants to claim 375g, 325g and 25g ground beef, 375g and 25g
spinach - what are the requirements for the collaborative study to get all of these test portion sizes
claimed in the OMA? Test 375g ground beef or spinach, test 325g ground beef, AND 25g ground
beef or spinach? Is there every an understanding that if you test the largest test portion size that the
others are covered?
2. Are unique test portions covered under the OMA if tested in the PTM - carcass rinse, carcass
sponge/swab, environmental surface testing? Is there an official response to this?
3. I want to confirm that ANY alternate enrichments tested in the PTM would be required in the
collaborative study. If there is a transfer step prior to testing of the alternative method, that would
also be considered an alternate enrichment.
4. A recent paper has described 5 new Listeria species, and shown how these species may be
associated or not to the existing top 6 Listeria species we usually refer too in our inclusivity studies
(L. monocytogenes, L. innocua, L. welshimeri, L. grayi, L. ivanovii and Listeria seeligeri), plus the
some species which have been described for more recent years, L. marthi, L. fleischmannii, L.
weihenstephanensis and L. rocourtiae.
Listeria floridensis sp. nov., Listeria aquatica sp. nov., Listeria cornellensis sp. nov., Listeria riparia sp.
nov. and Listeria grandensis sp. nov., from agricultural and natural environments
Reference: International Journal of Systematic and Evolutionary Microbiology (2014), 64, 1882–1889
DOI 10.1099/ijs.0.052720-0
PTM/OMA Review and Protocol development
Attachment 3
ERP PROFILE SUMMARIES
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