H.6 investigation summary: this memo is to summarize findings on complaint related to pail mueller hinton ii agar 25lb, catalog number 212257, batch 2046733, and complaint #5794043 for unsatisfactory performance, antibiotic inhibition.Components are milled and blended (where required) and dispensed into containers.Following qc release, and based upon inventory demand, final packaging operations occur, which include dispensing into and labeling of final configurations, followed by transport to the distribution center.The complaint investigation included a review of the batch history record.The batch history record review indicated no discrepancies.All release testing was satisfactory.Release testing includes powder appearance, solubility, prepared plate appearance, ph, and growth performance with organisms listed on the certificate of analysis.The complaint trends were reviewed for a period covering 12 months.During that time, there have been no confirmed complaints on this product for the defect in question.No returns or photos were received.A retention sample of the complaint batch of mueller hinton ii agar was tested per the kirby-bauer method of antimicrobial susceptibility for escherichia coli and gentamycin (gm-10) per current clsi standards, to show whether the smaller zone sizes were evident.The sample was prepared according to label instructions.The flask was mixed well to dissolved, then heated with frequent agitation and boiled for one minute.The media was autoclaved at 121°c for 15 minutes and allowed to cool to 45-50°c in a waterbath.Plates were poured.Plates were inoculated with escherichia coli atcc 25922 and triplicate discs of gm-10 were applied using a sensi-disc dispenser.Plates were incubated at 33-37°c for 16-18 hours.Expected recovery is confluent lawn of growth and zone sizes of 19 to 26 mm for gm-10 should be obtained.A confluent lawn of e.Coli growth was obtained on the plates.Zones were measured using calibrated calipers.All zones were within range at 23.94mm, 23.73mm and 23.23mm.The mean zone sizes from lot 2046733 release testing results of escherichia coli, atcc 25922 and pseudomonas aeruginosa, atcc 27853 and for those antibiotics/concentrations tested by bd are reported below.Specification: mean zone size (mm): atcc 25922, sxt, cip-5ug, 23-29, 30-40, 27.2, 33.3, atcc 27853, atm-30ug, gm-10ug, imp-10ug cip-5ug, 23-29, 17-23, 20-28, 25-33, 26.6, 21.9, 22.1, 28.1.Bd does not maintain zone size data for e.Faecalis atcc 29212, ampicillin am-2ug or s.Aureus atcc 29213 with am-2 ug, sxt-1.25ug/23.75ug, or va-5ug as they are not part of the release battery for this product.Bd was not able to confirm the smaller zone size defect described by the customer.This complaint cannot be confirmed.Bd will continue to trend dcm complaints for performance defects.H3 other text : see h.10.
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