ART4 and hemorrhagic fever: Machupo virus (MACV), a New World (NW) mammarenavirus, causes Bolivian hemorrhagic fever in humans, and there are no approved vaccines.<h4>Methods</h4>Here, we describe and compare the immunogenicity of three vaccines expressing the MACV glycoprotein complex (GPC) in C57BL/6 mice: a recombinant vesicular stomatitis virus (rVSV) and two different lipid nanoparticle (LNP)-encapsulated nucleoside-modified mRNA (mRNA-LNP) vaccines.