A customer in (b)(6) notified biomérieux of a discrepant result associated with chromid s.Aureus agar (reference 43371) involving absence of growth for a s.Aureus strain after 48 hours of incubation.An internal biomérieux investigation was performed with results as follows: retention sample of customer's lot (1004624450) and two random lots (1004639390/same manufacturing date and 1004875030/recent manufacture date) were tested with strains s.Aureus atcc 25923, s.Aureus atcc 6538, s.Xylosus atcc 29971 and s.Saprophyticus atcc 15305.Results- after 18-24 hour incubation at 33-37° c, the performance was within specifications for all strains without differences between lots regarding: numeration, size of colony and intensity of color.S.Aureus atcc 25923 and s.Aureus atcc 6538 produced the expected colony appearance.Both developed a spontaneous green coloration whereas, s.Xylosus atcc 29971 and s.Saprophyticus atcc 15305 were not able to produce glucosidase activity.Complaint trending was reviewed; no critical issues regarding product performance were detected.Review of raw data related to manufacturing process and quality control steps was performed.All specifications met and no observations or non-conformities found that could explain the performance problem reported by the customer.Biomérieux requested the strain from the customer; however, it was not possible to submit the strain.Based upon the results of the internal investigation, chromid s.Aureus agar is performing in accordance with product specifications.
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