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Four methods of detecting respiratory syncytial virus (RSV) from clinical specimens were evaluated. A total of 410 specimens consisting of nasopharyngeal washes, aspirates, and swabs were simultaneously tested for the presence of RSV by direct immunofluorescence assay (DFA), enzyme immunoassay (EIA) (Kallestad Pathfinder), shell vial centrifugation culture (SVC), and conventional culture. DFA identified 146 (83%) of the 175 positive cases, EIA detected 153 (87%), SVC detected 127 (73%), and conventional culture detected 70 (40%). Conventional culture isolated an additional 19 respiratory viruses other than RSV. DFA and EIA were able to detect nonviable virus not isolated by a culture method, and SVC isolated low-titer virus not detected by conventional culture. DFA and EIA gave similar results; however, the EIA system was less dependent on technical expertise. The use of SVC enhanced the conventional culture system with 63 RSV isolates not recovered from the tube culture. We recommend complementary use of both culture and nonculture methods in the detection of RSV.

journal of clinical microbiology

Evaluation of direct immunofluorescence, enzyme immunoassay, centrifugation culture, and conventional culture for the detection of respiratory syncytial virus