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A total of 525 stool specimens collected during 1 year were examined for the presence of rotavirus by direct electron microscopy (EM), enzyme-linked immunosorbent assay (ELISA), and a solid-phase immune electron microscope method (SPIEM) utilizing protein A-coated grids for anchoring of specific viral antisera. Rotavirus was seen in 187 specimens; SPIEM detected 183 (97.8%), whereas direct EM and ELISA detected 161 (86%) and 166 (88.7%), respectively. No false-positive reactions were seen by ELISA. The sensitivity of the methods was evaluated by coded investigation of a dilution series of a positive sample, with a negative fecal specimen as diluent. SPIEM was approximately 30 times more sensitive than direct EM and 10 times more sensitive than ELISA. A study was done to compare the elapsed time for recognition of rotavirus by SPIEM and EM in 25 randomly selected positive specimens. All virus-positive specimens were detected within 2 min by SPIEM, whereas up to 9 min was required for direct EM. SPIEM with protein A is a highly sensitive method, useful for rapid detection of viruses in clinical specimens. Due to the direct visualization of virus particles by electron microscopy, there is no requirement for monospecific antisera for the method.

journal of clinical microbiology

Comparison of solid-phase immune electron microscopy by use of protein A with direct electron microscopy and enzyme-linked immunosorbent assay for detection of rotavirus in stool