Accelerated identification of Staphylococcus aureus from blood cultures by a modified fluorescence in situ hybridization procedure.
This study evaluated fluorescence in situ hybridization (FISH) for rapid identification of Staphylococcus aureus and coagulase-negative staphylococci (CoNS) directly from blood cultures. Initially, 360 blood cultures containing Gram-positive cocci were investigated by a previously described microwave-FISH procedure: 44/49 (89.8 %) S. aureus and 298/299 (99.7 %) CoNS were correctly identified. Because FISH proved useful and reliable but handling was found to be inconvenient, the method was modified by employing a recently developed slide chamber. This reduced the time required from 60 to 30 min. The simplified execution allowed integration of the method into the workflow of a routine laboratory without difficulty. The modified method proved to be highly reliable, identifying 37/37 (100 %) S. aureus and 169/172 (98.2 %) CoNS directly from blood cultures.
Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany.
Sven
S
Poppert
Institute of Medical Microbiology and Hygiene, University of Ulm, Ulm, Germany.
Melanie
M
Riecker
Institute of Medical Microbiology and Hygiene, University of Ulm, Ulm, Germany.
Nele
N
Wellinghausen
Institute of Medical Microbiology, Virology and Hygiene, University of Rostock, Rostock, Germany.
Hagen
H
Frickmann
Institute of Medical Microbiology and Hygiene, University of Ulm, Ulm, Germany.
Andreas
A
Essig
D001431:Bacteriological Techniques; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D008872:Microwaves; D013203:Staphylococcal Infections / Q000097:blood* / Q000382:microbiology*; D013211:Staphylococcus aureus / Q000302:isolation & purification*