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1 ©2016, G.R. Acuff Process Validation Pathogens, Indicators or Surrogates Gary R. Acuff Director, Texas A&M Center for Food Safety Professor, Food Microbiology
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2 ©2016, G.R. Acuff Validation Does your process control actually work? How well?
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3 ©2016, G.R. Acuff How to Use the Data Performance Objective The maximum frequency and/or concentration of a hazard in a food at the time of consumption that provides or contributes to the appropriate level of protection. Performance Objective The maximum frequency and/or concentration of a hazard in a food at the time of consumption that provides or contributes to the appropriate level of protection.
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4 ©2016, G.R. Acuff Performance Objective H 0 - ∑R + ∑I ≤ PO PO = Performance Objective H 0 = Initial level of the hazard ∑R = Total (cumulative) reduction of the hazard ∑I = Total (cumulative) increase of the hazard PO, H 0, R and I are expressed in log 10 units H 0 - ∑R + ∑I ≤ PO PO = Performance Objective H 0 = Initial level of the hazard ∑R = Total (cumulative) reduction of the hazard ∑I = Total (cumulative) increase of the hazard PO, H 0, R and I are expressed in log 10 units
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5 ©2016, G.R. Acuff Performance Objective H 0 - ∑R + ∑I ≤ PO 3 - ∑R + 0 ≤ -2 3 - ∑R ≤ -2 ∑R ≤ -5 ∑R ≥ 5
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6 ©2016, G.R. Acuff Validation Does your process control actually work? How well? Qualitative end product sampling provides insufficient information.
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7 ©2016, G.R. Acuff Ideal Situation Validate Process Control Measure hazard (pathogen) presence Pre- and post-CCP Primary focus Final product Also helpful Requires sufficient levels of pathogen
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8 ©2016, G.R. Acuff Example: Validation of Beef Carcass Interventions Pathogen presence on carcass surface Inconsistent Low levels Insufficient for confirmation of process control A measureable alternative? Indicator bacteria Aerobic Plate Count (APC), Lactic acid bacteria, Enterobacteriaceae, coliforms, fecal coliforms, E. coli, enterococci
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9 ©2016, G.R. Acuff Example: Log Reduction of E. coli O157:H7 and Aerobic Plate Count (Feces) on Beef Carcass Surfaces Log Reductions
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10 ©2016, G.R. Acuff Example: Log Reduction of E. coli O157:H7 and Coliforms (Feces) on Beef Carcass Surfaces Log Reductions
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11 ©2016, G.R. Acuff A more consistent alternative… Surrogates American Type Culture Collection (ATCC) www.atcc.org Biosafety Level 1 Tested against salmonellae & STECs Accession numbers BAA-1427 to BAA-1431 Non-pathogenic Escherichia coli Surrogates Indicators Panel (ATCC MP-26) Why ATCC?
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12 ©2016, G.R. Acuff Available Options Presence/absence of hazard (pathogen) Detect naturally occurring traditional indicator bacteria Inoculate and measure reductions Traditional indicator bacteria (source?) Surrogates (AskFSIS)
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13 ©2016, G.R. Acuff
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14 ©2016, G.R. Acuff Validate Process Control Enumeration of naturally-occurring hazard before and after CCP Inoculate with hazard Inoculate with surrogate Enumerate indicators before and after Research study conducted in facility Reference published journal article Increasing Strength
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