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Some viruses that belong to theArenaviridae family, like Lassa and Junín viruses, are notorious human pathogens, which may lead to fatal outcomes when they infect people. It is thus important to develop means to combat these viruses. For developing effective vaccines, it is vital to understand the basic mechanisms that these viruses utilize in order to evade or overcome host immune responses. It was previously noted that the GP1 receptor-binding domain from Lassa virus is shed and accumulates in the serum of infected individuals. This raised the possibility that Lassa virus GP1 may function as an immunological decoy. Here we demonstrate that mice develop nonproductive immune responses against GP1 from Lassa virus, which is in contrast to the effective neutralizing responses that GP1 from Junín virus elicits. Thus, GP1 from Lassa virus is indeed an immunological decoy and GP1 from Junín virus may serve as a constituent of a future vaccine.

Differential Antibody-Based Immune Response against Isolated GP1 Receptor-Binding Domains from Lassa and Junín Viruses