Welcome to FWQRC Regulatory focus news LetterHere we are going to review on the Outbreak Investigation of Listeria monocytogenes Linked to Hard-Boiled Eggs, December 2019FDA, CDC, and state and local partners are currently investigating a multistate outbreak of Listeria monocytogenes infections linked to foods that contain hard-boiled eggs. On December 20, 2019, Almark Foods recalled and suspended production of hard-boiled and peeled eggs in pails due to the potential for contamination with Listeria monocytogenes. These hard-boiledand peeled eggs were sold in pails under the following names: Rainbow Select Hard-cooked Eggs, Rainbow Select Hard-cooked Eggs in Vinegar, Nic’s Salad Hard-boiled Eggs, Almark Hard-cooked Eggs, and Sutherland Select Hard-cooked Eggs. A full list of recalled products is included below.RecommendationFood processors, restaurants, and retailers should not sell or serve any of the recalled hard-boiled and peeled eggs in pails from Almark Foods. These products were not sold directly to consumers.Additionally, FDA recommends that food processors, restaurants and retailers who have received Almark Foods bulk, fresh hard-boiled eggs, use extra vigilance in cleaning and sanitizing any surfaces that may have come in contact with these products, to reduce the risk of cross-contamination.Background:As of December 17, 2019, a total of seven people infected with the outbreak strain of Listeria monocytogenes have been reported from five states. In interviews, ill people answered questions about the foods they ate and other exposures in the month before they became ill. Of the five people for whom information was available, four reported eating products containing eggs. Three of these people reported eating hard-boiled eggs in deli salads purchased from grocery stores and in salads eaten at restaurants. Illnesses started on dates ranging from April 10, 2017 to November 12, 2019.Additionally, based on whole-genome sequencing, the Listeria monocytogenes found in environmental samples collected at the firm’s processing facility during an FDA inspection conducted in February 2019 is a genetic match to the outbreak strain. FDA is conducting additional inspections and sampling. Almark Foods has been cooperating with the ongoing investigation and announced a voluntary recall of hard-boiled and peeled eggs in pails on December 20, 2019.This outbreak strain was found during environmental sampling in 2017 of one other food facility. That facility is not currently handling food and ceased operation in 2018.Thank you for viewing FWQRC blogs….
Hi, Welcome to FWQRC Regulatory Focus News Letter.
Here we are going to discuss about the finalised rule for the submission process.
Today we are going to discuss on the Genotoxic Impurities and its assessments.
The toxicological assessment of genotoxic impurities and the determination of acceptable limits for such impurities in active substances is a difficult issue.
The data set usually available for genotoxic impurities is quite variable and is the main factor that dictates the process used for the assessment of acceptable limits.
In the absence of data usually needed for the application of one of the established risk assessment methods, i.e. data from carcinogenicity long-term studies or data providing evidence for a threshold mechanism of genotoxicity, implementation of a generally applicable approach as defined by the Threshold of Toxicological Concern (TTC) is proposed.
A TTC value of 1.5 µg/day intake of a genotoxic impurity is considered to be associated with an acceptable risk (excess cancer risk of <1 in 100,000 over a lifetime) for most pharmaceuticals.
From this threshold value, a permitted level in the active substance can be calculated based on the expected daily dose. Higher limits may be justified under certain conditions such as short-term exposure periods.
For determination of acceptable levels of exposure to genotoxic carcinogens considerations of possible mechanisms of action and of the dose-response relationship are important components. Based on the above considerations genotoxic impurities may be distinguished into the following two classes:
- Genotoxic compounds with sufficient (experimental) evidence for a threshold-related mechanism
This approach calculates a “Permitted Daily Exposure” (PDE), which is derived from the NOEL, or the lowest- observed effect level (LOEL) in the most relevant (animal) study using “uncertainty factors” (UF).
- Genotoxic compounds without sufficient (experimental) evidence for a threshold-related mechanism
The assessment of acceptability of genotoxic impurities for which no threshold mechanisms are identified should include both pharmaceutical and toxicological evaluations. In general, pharmaceutical measurements should be guided by a policy of controlling levels to “as low as reasonably practicable” (ALARP principle), where avoiding is not possible. Levels considered being consistent with the ALARP principle following pharmaceutical assessment should be assessed for acceptability from a toxicological point of view.
A TTC value higher than 1.5 µg/day may be acceptable under certain conditions, e.g. short-term exposure, for treatment of a life-threatening condition, when life expectancy is less than 5 years, or where the impurity is a known substance and human exposure will be much greater from other sources (e.g. food). Genotoxic impurities that are also significant metabolites may be assessed based on the acceptability of the metabolites.
The concentration limits in ppm of genotoxic impurity in drug substance derived from the TTC can be calculated based on the expected daily dose to the patient using equation (1).
(1) Concentration limit (ppm) = TTC [µg/day]/dose (g/day]
The TTC concept should not be applied to carcinogens where adequate toxicity data (long-term studies) are available and allow for a compound-specific risk assessment.
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