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Four noncompeting monoclonal antibodies (MA) directed against either the E1 (UM 8.64 and 8.139) or E2 (UM 8.55 and 8.73) glycoprotein of Semliki Forest virus were purified and labeled with horseradish peroxidase. Each enzyme-labeled MA was tested alone and in combination with others for its sensitivity to detect virus-infected cells. Semliki Forest virus-infected L cells seeded as monolayers in 96-well plates were screened for the virus after incubation with enzyme-labeled MA and a substrate. In this system single enzyme-labeled MA even at high dilution (10(3.0) to 10(4.5] were able to detect virus-infected cells. The sensitivity of the test could be enhanced by combining two noncompeting MA (10(4.5) to 10(5.0]. Combinations of three and four MA were less effective, due to high absorbance values for noninfected cells. The threshold of virus defection was between 10(5) and 10(6) PFU/ml. This test is sensitive and specific and therefore may be useful for diagnostic purposes.

journal of clinical microbiology

Detection of Semliki Forest virus in cell culture by use of an enzyme immunoassay with peroxidase-labeled monoclonal antibodies specific for glycoproteins E1 and E2