Diagnostic electron microscopy provides a rapid survey about pathogens present in a sample. All micro and nanoparticles, including the smallest known virus particles, can be detected based on morphological criteria, which allows to reveal and to describe even emerging pathogens. At best, the investigation by electron microscopy provides a quick tentative diagnosis which guides and speeds up a further, more specific diagnosis. Additionally, diagnostic electron microscopy may exclude the presence of a suspected pathogen and serve as an independent control for the diagnosis by other methods.

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