Abstract
Electron microscopy (EM) allows fast visualization of viruses in a wide range of clinical specimens. Viruses are grouped into families based on their morphology. Viruses from various families look distinctly and these morphological variances are the basis for identification of viruses by EM. The identification to the family level is often sufficient for the clinician or recognition of an unknown infectious agent. Diagnostic EM has two advantages over enzyme-linked immunosorbent assay and nucleic acid amplification tests. After a simple and fast negative staining, EM allows fast morphological identification and differential diagnosis of infectious agents contained in the specimen without the need for special considerations and/or reagents. Nevertheless, EM has the disadvantage of being unsuitable as a screening method.
Keywords: Gastroenteritis, Negative Staining, Rapid Diagnosis, Severe Acute Respiratory Syndrome, Nucleic Acid Amplification Test
Abbreviations
- CSF
cerebrospinal fluid
- ELISA
enzyme-linked immunosorbent assay
- EM
electron microscopy
- IEM
immune electron microscopy
- NAT
nucleic acid amplification (techniques)
- PBS
phosphate-buffered saline
- PCR
polymerase chain reaction
- PTA
phosphotungstic acid
- SARS
severe acute respiratory syndrome
- SPIEM
solid phase immune electron microscopy
- NRL/ELM
National Reference Laboratory For Direct Diagnosis Of Viruses, Borreliae And Foreign Cell In Clinical Specimens
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