This overview addresses fluorescence in situ hybridization (FISH) in a diagnostic microbiology setting with its associated problems and pitfalls and how to control them, but also the advantages and opportunities the method offers. This article focuses mainly on diagnostic FISH assays on tissue sections and on techniques and experiences in our laboratory. FISH in a routine diagnostic setting in microbiology requires strict quality control measures to ensure consistent high-quality and reliable assay results. Here, for the first time, we define quality control requirements for microbiological diagnostic FISH applications and discuss their impact and possible future developments of the FISH technique for infection diagnostics. We focus on diagnosis of biofilm-associated infections including infective endocarditis, oral biofilms, and device-associated infections as well as infections due to fastidious or yet uncultured microorganisms like Treponema spp., Tropheryma whipplei, Bartonella, Coxiella burnetii, or Brachyspira.
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