Comparison of VIDAS with direct immunofluorescence for the detection of respiratory syncytial virus in clinical specimens. 1999

E Hadziyannis, and W Sholtis, and S Schindler, and B Yen-Lieberman
Department of Clinical Pathology, Division of Pathology and Laboratory Medicine, The Cleveland Clinic Foundation, OH, USA.

BACKGROUND requirements for infection control measures and the decision for treatment with antiviral agents make the rapid detection of respiratory syncytial virus (RSV) essential for hospitalized, pediatric and immunocompromised patients. Immunofluorescence is considered to be the most rapid and sensitive method for direct detection of RSV in clinical specimens, but several enzyme-linked immunoassays have also been commercially available. OBJECTIVE to compare the performance of VIDAS RSV assay (Vitek ImmunoDiagnostic Assay System, BioMerieux Vitek), which is an automated enzyme-linked fluorescent immunoassay (ELFA) to direct immunofluorescence (DFA), in rapid detection of RSV in respiratory specimens. METHODS respiratory specimens collected during the 'RSV season', between the months of November 1997 and February 1998, were tested by both methods. DFA was performed upon receipt of the sample and an aliquot of the original specimen was stored in -70 degrees C for batch testing with VIDAS. RESULTS from 238 samples that were tested, 231 could be evaluated by both methods. The two assays were in agreement for 213 specimens (92%), or 32 positive and 181 negative results. Eighteen discrepant results were generated; seven specimens were VIDAS-/DFA+ and 11 specimens were VIDAS+/DFA-. In addition, seven specimens had an inadequate number of cells for evaluation with DFA. One of these samples tested positive with VIDAS. VIDAS relative sensitivity and specificity were 82% and 94%, respectively, when compared to DFA. CONCLUSIONS VIDAS is simple to perform, does not require expertise in interpretation and appears to be an acceptable method for the rapid detection of RSV.

UI MeSH Term Description Entries
D011933 Reagent Kits, Diagnostic Commercially prepared reagent sets, with accessory devices, containing all of the major components and literature necessary to perform one or more designated diagnostic tests or procedures. They may be for laboratory or personal use. Diagnostic Reagent Kits,Diagnostic Reagents and Test Kits,Diagnostic Test Kits,In Vitro Diagnostic Device,In Vitro Diagnostic Devices,In Vitro Diagnostic Medical Device,In Vitro Diagnostic Medical Devices,Kits, Diagnostic Reagent,Diagnostic Reagent Kit,Diagnostic Test Kit,Kit, Diagnostic Reagent,Kit, Diagnostic Test,Kits, Diagnostic Test,Reagent Kit, Diagnostic,Test Kit, Diagnostic,Test Kits, Diagnostic
D004797 Enzyme-Linked Immunosorbent Assay An immunoassay utilizing an antibody labeled with an enzyme marker such as horseradish peroxidase. While either the enzyme or the antibody is bound to an immunosorbent substrate, they both retain their biologic activity; the change in enzyme activity as a result of the enzyme-antibody-antigen reaction is proportional to the concentration of the antigen and can be measured spectrophotometrically or with the naked eye. Many variations of the method have been developed. ELISA,Assay, Enzyme-Linked Immunosorbent,Assays, Enzyme-Linked Immunosorbent,Enzyme Linked Immunosorbent Assay,Enzyme-Linked Immunosorbent Assays,Immunosorbent Assay, Enzyme-Linked,Immunosorbent Assays, Enzyme-Linked
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012680 Sensitivity and Specificity Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed) Specificity,Sensitivity,Specificity and Sensitivity
D018113 Respiratory Syncytial Virus, Human The type species of PNEUMOVIRUS and an important cause of lower respiratory disease in infants and young children. It frequently presents with bronchitis and bronchopneumonia and is further characterized by fever, cough, dyspnea, wheezing, and pallor. HRSV Human respiratory syncytial virus,Human respiratory syncytial virus,human RSV,RSV, human,human RSVs
D018357 Respiratory Syncytial Virus Infections Pneumovirus infections caused by the RESPIRATORY SYNCYTIAL VIRUSES. Humans and cattle are most affected but infections in goats and sheep have been reported. RSV Infection,Infections, Respiratory Syncytial Virus,Respiratory Syncytial Virus Infection,Infection, RSV,RSV Infections
D019085 Fluorescent Antibody Technique, Direct A form of fluorescent antibody technique utilizing a fluorochrome conjugated to an antibody, which is added directly to a tissue or cell suspension for the detection of a specific antigen. (Bennington, Saunders Dictionary & Encyclopedia of Laboratory Medicine and Technology, 1984) Immunofluorescence Antibody Test, Direct,Immunofluorescence Technique, Direct,Direct Fluorescent Antibody Technic,Direct Fluorescent Antibody Technique,Direct Immunofluorescence,Direct Immunofluorescence Assay,Fluorescent Antibody Technic, Direct,Immunofluorescence Technic, Direct,Assay, Direct Immunofluorescence,Assays, Direct Immunofluorescence,Direct Immunofluorescence Assays,Direct Immunofluorescence Technic,Direct Immunofluorescence Technics,Direct Immunofluorescence Technique,Direct Immunofluorescence Techniques,Direct Immunofluorescences,Immunofluorescence Assay, Direct,Immunofluorescence Assays, Direct,Immunofluorescence Technics, Direct,Immunofluorescence Techniques, Direct,Immunofluorescence, Direct,Immunofluorescences, Direct

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