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  • Title: Protective activity of anti-lipoteichoic acid monoclonal antibody in single or combination therapies in methicillin-resistant Staphylococcus aureus-induced murine sepsis models.
    Author: Ohsawa H, Baba T, Enami J, Hiramatsu K.
    Journal: J Infect Chemother; 2020 May; 26(5):520-522. PubMed ID: 32001173.
    Abstract:
    Previously, we generated and screened a panel of monoclonal antibodies (mAbs) against methicillin-resistant Staphylococcus aureus (MRSA) to identify protective mAbs in mouse infection models. One of these mAbs, ZBIA3H, bound to lipoteichoic acid (LTA) and exerted protective effects in a mouse sepsis model. To reinforce the ability of the mAb to protect against infection, combination therapies with the mAb and antibiotics need to be examined. Therefore, herein, we studied the efficacy of ZBIA3H (in combination or alone) in a mouse sepsis model. ZBIA3H improved the survival rate in the mouse models of sepsis induced by highly virulent or refractory S. aureus (community-acquired MRSA strain MW2, vancomycin-intermediate S. aureus strain Mu3, or vancomycin-resistant S. aureus strain VRS1). Furthermore, ZBIA3H remarkably improved the survival rate in combination with antimicrobial agents (vancomycin, daptomycin, or linezolid) in mouse sepsis models. From these results we conclude that anti-LTA mAb ZBIA3H or its humanized form is a promising mAb individually, or in combination with antibiotics, against clinical refractory infection of S. aureus.
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