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Monoclonal Antibodies Define Antigenic Variation in the ID Variety of Venezuelan Equine Encephalitis Virus

Rebeca Rico-Hesse

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John T. RoehrigDivision of Vector-Borne Viral Diseases, Center for Infectious Diseases, Centers for Disease Control, Public Health Service, U.S. Department of health and Human Services, P.O. Box 2087, Fort Collins, Colorado 80522

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Robert W. DickermanDepartment of Microbiology, Cornell University Graduate School of Medical Sciences, 1300 York Avenue, New York, New York 10021

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Three monoclonal antibodies were generated that are specific for the E2 glycoprotein of Venezuelan equine encephalitis (VEE) virus and have useful reactivities in an enzyme-linked immunosorbent assay (ELISA). Antibody 1A1B-9 distinguished between the IC (epizootic) and ID (enzootic) varieties of VEE virus by ELISA. Clone 7A1A-1 antibody distinguished the Panamanian prototype virus (3880) from Colombian ID isolates by a 500-fold difference in titer by endpoint ELISA, and it detected antigenic variation in ID isolates from southern Colombia and Ecuador. Antibody 7A3A-4 defined a cryptic antigenic site on the latter two isolates. These monoclonal antibodies complement others in identifying VEE isolates by a simple ELISA.

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