Estudios originales

Published on 9 de enero de 2026 | http://doi.org/10.5867/medwave.2026.01.3049

Identification and susceptibility profile of microorganisms isolated directly from urine in a cross-sectional study using matrix-assisted laser desorption/ionization time-of-flight and Phoenix M50

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Results of direct identification of Gram-negative microorganisms compared with culture identification.
Direct ID Using MALDI-TOF (Number of samples)Media score IDScore (Minimum– Maximum)Culture results (n)Concordance (%)
E. coli (261)2.161.55 - 2.43E. coli (257), negative culture (4)98,46
K. pneumoniae (28)2.181.89 - 2.41K. pneumoniae (27), E. coli (1)96,42
E. hormaechei (5)2.081.9 - 2.16E. hormaechei (4), E. kobei (1)80
C. freundii (2)2.272.24 - 2.31C. freundii (2)100
P. aeruginosa (2)2.001.86 - 2.14P. aeruginosa (2)100
P. mirabilis (3)2.241.99 - 2.55P. mirabilis (3)100
C. koseri (1)2.06-C. koseri (1)100
K. variicola [1]2.32-K. variicola (1)100
Not identified (24)--Gram-negative bacillus (16), negative culture (8)Not applicable
S. marcescens + E. coli (1)1.86/1.79-S. marcescens + P. aeruginosa (1)Not applicable
P. aeruginosa + E. coli (1)2.07/2.1-P. aeruginosa (1)Not applicable
E. coli + K. pneumoniae (1)2.08/2.07-E. coli + K. pneumoniae (1)Not applicable

ID, identification.

Source: Prepared by the authors of this study.