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Scientific result | Vaccine
Researchers from Pasteur Institute, in collaboration with seven research teams, including SPI (LI2D/Marcoule), developed and evaluated the efficacy of several vaccine candidates against the virus responsible for Lassa haemorrhagic fever, endemic in Western Africa. They identified one of them as being the most effective, likely to quickly enter clinical trials in humans. Results are published in the journal Science Translational Medicine.
Lassa fever is a major threat in Western Africa. The large number of people living at risk for this disease calls for the development of a vaccine against Lassa virus (LASV). We generated live-attenuated LASV vaccines based on measles virus and Mopeia virus platforms and expressing different LASV antigens, with the aim to develop a vaccine able to protect after a single shot. We compared the efficacy of these vaccines against LASV in cynomolgus monkeys. The vaccines were well tolerated and protected the animals from LASV infection and disease after a single immunization but with varying efficacy. Analysis of the immune responses showed that complete protection was associated with robust secondary T cell and antibody responses against LASV. Transcriptomic and proteomic analyses showed an early activation of innate immunity and T cell priming after immunization with the most effective vaccines, with changes detectable as early as 2 days after immunization. The most efficacious vaccine candidate, a measles vector simultaneously expressing LASV glycoprotein and nucleoprotein, has been selected for further clinical evaluation.
M Mateo, S Reynard, X Carnec, A Journeaux, N Baillet, J Schaeffer, C Picard, C Legras-Lachuer, R Allan, E Perthame, KH Hillion, N Pietrosemoli, MA Dillies, L Barrot, A Vallve, S Barron, L Fellmann, JC Gaillard, J Armengaud, C Carbonnelle, H Raoul, F Tangy, S Baize. Vaccines inducing immunity to Lassa virus glycoprotein and nucleoprotein protect macaques after a single shot, Science Translational Medicine, 2 octobre 2019
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.