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A united states customer submitted their cap d-08 2018 alcaligenes faecalis ssp faecalis strain for piperacillin/tazobactam (tzp) evaluation because the customer reported resistant tzp results, but the expected result was susceptible.The customer originally tested the organism on vitek® 2 ast-gn69 lot 5890711103 and obtained a tzp mic>=128.Biomérieux internal investigation was conducted.For this investigation, the biomerieux internal 2018 cap d-08 strain was tested.The biomerieux cap d-08 survey strain was sub-cultured on tsab agar, identification confirmed as a.Faecalis ssp faecalis, and testing included ast-gn95 (6850485403), ast-gn67 (5870659203), ast-gn69 (5890711103) card lots in duplicate as well as broth microdilution (bmd) as the reference method for tzp03n formulation found on all card types associated with this investigation.911704 (biomerieux internal d-08 strain): - for the ast gn cards tested, susceptible mic <= 4, intermediate mic = 64 and resistant mics => 128 were all obtained.- bmd gave a susceptible mic <= 4.- card and reference method are in agreement for three (3) of six (6) cards tested while the remaining three (3) cards demonstrated a major error for vitek 2 when compared to reference, duplicating the customers results.This investigation concluded the cap strain to be atypical.The strain will be added to the r&d stock collection.
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