title: Rapid 24-well plate centrifugation assay for detection of influenza A virus in clinical specimens.
abstract: Two methods for detection of influenza virus in 234 clinical respiratory specimens were compared: (i) a 24-well plate-centrifugation assay using Madin Darby canine kidney (MDCK) cells and staining with monoclonal antibody pools to influenza A and B (Centers for Disease Control, Atlanta, GA) after incubation for 16 h and 40 h, and (ii) conventional tube cell culture using MDCK cells and primary rhesus monkey kidney cells. Influenza A was identified in 23 specimens (10%). No influenza B was recovered. The rapid centrifugation and tissue culture methods were positive for influenza A in 21 (91%) and 16 (70%) of the 23 specimens, respectively. Fourteen specimens were positive by both methods, 2 were positive by tissue culture alone, and 7 were positive by rapid centrifugation only. Of the 21 specimens positive by rapid centrifugation, 16 (76%) were detected after overnight incubation, and 5 (24%) were positive only after incubation for 40 h. Cytopathic effect was observed in 13 (81%) of the 16 isolates identified by tissue culture after an average of 6 days, and 3 (19%) were identified only by hemadsorption and staining with monoclonal antibodies at day 10. Compared with conventional tissue culture, the 24-well plate centrifugation assay is a more rapid and more sensitive method for detecting influenza virus in clinical specimens.
authors.affiliation: Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha 68105.
authors.forename: G L
authors.initials: GL
authors.lastname: Woods
authors.forename: A M
authors.initials: AM
authors.lastname: Johnson
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D002478:Cells, Cultured; D002498:Centrifugation / Q000379:methods; D005455:Fluorescent Antibody Technique; D006801:Humans; D009980:Influenza A virus / Q000302:isolation & purification*; D009981:Influenza B virus / Q000302:isolation & purification; D013997:Time Factors
chemical_list: D000911:Antibodies, Monoclonal