This report was initially submitted due to vitek 2 gn id misidentification of escherichia coli as acinetobacter or aeromonas.
Biomérieux investigation was conducted following receipt of the patient isolate submitted by the customer.
The isolate was subcultured and testing included two (2) gn id cards from the same lot tested by the customer, two (2) gn id cards from a random lot, the api 20e, and 16s sequencing.
The two gn cards from the random lot and one card from the customer lot gave low discrimination calls of escherichia coli/aeromonas sobria.
The second gn card from the customer lot gave a good identification of escherichia coli.
The api 20e gave a low discrimination identification of escherichia coli/citrobacter koseri/farmerii.
The 16s sequencing identified the isolate as escherichia coli.
Review of the customer's aeromonas sobria data against expected reactions for escherichia coli demonstrated seven atypical negative reactions as well as one atypical positive reaction, contributing to the misidentification.
The investigation concluded this is an atypical strain for the vitek 2 gn knowledge base.
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