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An internal biomérieux investigation was initiated due to a customer reporting a misidentification of streptococcus sanguis (identification from reference lab) as pediococcus pentosaceus with the vitek® 2 gp id card.Note: s.Sanguis is the former name for s.Sanguinis which is the nomenclature recognized in the vitek 2 gp knowledge base.The customer submitted their strain for evaluation.The submitted strain was subcultured to tsab and incubated at 37°c in co2 atmosphere.The vitek 2 gp id card testing included individual organism suspensions with cards from the customer lot (2420617403) and a random lot (2420561103) in duplicate.Additional testing included vitek ms and api 20 strep kit.911634 : two gp cards tested resulted in excellent identifications of streptococcus anginosus and the remaining two gp cards resulted in low discrimination identifications streptococcus anginosus / streptococcus gordonii.Vitek ms resulted in an identification of s.Anginosus with a 99.9% confidence value and api 20 strep kit resulted in a 91.1 % identification of s.Anginosus.The final identification of this strain is s.Anginosus.A review of the customer's p.Pentosaceus reactions demonstrated eight atypical negative reactions ( amy, appa, phos, tyra, polyb, lac, novo, adh2s) for an identification of s.Anginosus according to the gp knowledge base.An increased number of atypical negative results can indicate a strain with decreased viability, user set up error or an atypical strain.The vitek 2 gp id cards performed as expected.
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