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Infect. Immun., 01 1997, 317-319, Vol 65, No. 1
Copyright © 1997, American Society for Microbiology

Chlamydia trachomatis major outer membrane protein variants escape neutralization by both monoclonal antibodies and human immune sera

MF Lampe, KG Wong, LM Kuehl and WE Stamm
Department of Medicine, University of Washington, Seattle 98195, USA. lampe@u.washington.edu

We have identified two families of novel Chlamydia trachomatis isolates with amino acid changes within the major outer membrane protein (MOMP) variable domains: one family of Da, D*, and D- and one family of Ia and I-. In order to determine whether these MOMP variants can escape antibody neutralization of infectivity, we tested both the D and I prototype strains and the variants in a complement-independent in vitro neutralization assay. We found that variants can indeed escape neutralization by both monoclonal antibodies and polyclonal human immune sera that neutralize the prototype strain.

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