An investigation into a false negative event while using the chromid® staph aureus plates was performed.The chromid® staph aureus failed to grow a qc-strain on multiple attempts.A complaint trend review was performed on this lot.No other similar complaints have been received.Four atcc® quality control samples (atcc® 2593, atcc® 6538, atcc® 29971, and atcc® 15305) were inoculated onto retain plates from the implicated lot as well as 4 lots from varying expiry dating, similar to implicated plates, at expiry, middle of shelf-life, and freshly manufactured.Additionally, customer returned samples were inoculated with the same atcc® quality control samples.All plates inoculated grew the organism as expected.Based on the results of the investigation, the complaint could not be confirmed and the product is operating within specifications.
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