H6: investigation summary: this statement is to summarize findings on the recent complaint against columbia cna agar with 5% sheep blood, catalog number 257306, lot number 1127957.Event description: it was reported that contamination was detected on some plates.Complaint history review: the complaints trends were reviewed.There were no similar complaints received on this batch number.Therefore, a trend could not be identified.Batch history record (bhr) review: the batch history review did not indicate any discrepancies.All release testing was satisfactory, and no deviations were observed.Sample analysis: the retain samples were reviewed and no deviation could be detected.Pictures were provided showing the reported contamination.Evaluation results: at this stage of our investigation, we have excluded any systemic failure in our manufacturing process.Please note that this product does not have an sal claim.It is filled aseptically, therefore an occurrence of a contamination event cannot be entirely ruled out.Please note that the valid standard for these products is din en 12322 "in vitro diagnostic medical devices - culture media for microbiology".According to this standard the contamination rate for each product lot must not exceed 4.9 %.For our continuous monitoring, we derive a contamination ratio for below this specified value.According to our high quality standard, we only release product batches to the market with an aql (acceptable quality level) = 1.5.Although this contamination level is very low, we cannot completely exclude that a customer may receive a contaminated plate.Investigation conclusion: based on the evaluation of the provided report and picture sample, the complaint was confirmed.A corrective and preventive action will not be implemented as a trend could not be identified.A definite root cause could not be determined.We would suggest that you set aside, and not use, any prepared plated media that does not meet the appearance specification as it is described on the bd certificate of analysis.This is consistent with industry recommendations for inspection of culture media prior to use (e.G.¿good practices for pharmaceutical microbiology laboratories¿, who technical report series, no.961, 2011, annex 2; chapter <1117> ¿microbiology best laboratory practices¿ the united states pharmacopeia; and the difco & bbl manual).
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