The HCMV-neutralizing monoclonal antibody MSL-109 failed to prevent HCMV-induced disease in the clinic. In this issue of Cell Host & Microbe, Manley et al. (2011) found that MSL-109 rapidly induces antibody resistance by a nongenetic mechanism. Their results shed light on how antibodies can interact with their targets both outside and inside infected cells and virions.
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