The invention relates to a mutant of an arenavirus having improved antitumoral properties. The invention also relates to a method of generating such an arenavirus mutant, related pharmaceutical compositions, medical uses, methods of treatment, and isolated proteins and nucleic acids.

The invention relates to recombinant measles virus expressing Lassa virus polypeptides, and concerns in particular immunogenic LASV particles expressed by a measles virus and/or virus like particles (VLPs) that contain proteins of a Lassa virus. These particles are recombinant infectious particles able to replicate in a host after an administration. The invention provides means, in particular nucleic acid constructs, vectors, cells and rescue systems to produce these recombinant infectious particles. The invention also relates to the use of these recombinant infectious particles, in particular under the form of a composition, more particularly in a vaccine formulation, for the treatment or prevention of an infection by Lassa virus.

Compositions and methods are described for generating an immune response to an arenavirus. The compositions and methods described herein relate to a modified vaccinia Ankara (MVA) vector encoding one or more viral antigens for generating a protective immune response to a member of genus Arenavirus (such as a member of species Lassa virus) in the subject to which the vector is administered. The compositions and methods of the present invention may be used to prevent and/or treat an infection caused by arenavirus.

The invention relates to recombinant measles virus expressing Lassa virus polypeptides, and concerns in particular immunogenic LASV particles expressed by a measles virus and/or virus like particles (VLPs) that contain proteins of a Lassa virus. These particles are recombinant infectious particles able to replicate in a host after an administration. The invention provides means, in particular nucleic acid constructs, vectors, cells and rescue systems to produce these recombinant infectious particles. The invention also relates to the use of these recombinant infectious particles, in particular under the form of a composition, more particularly in a vaccine formulation, for the treatment or prevention of an infection by Lassa virus.

The invention relates to a mutant of an arenavirus having improved antitumoral properties. The invention also relates to a method of generating such an arenavirus mutant, related pharmaceutical compositions, medical uses, methods of treatment, and isolated proteins and nucleic acids.

The invention relates to methods of treating or preventing a tumor.