- A live attenuated vaccine for Lassa fever made by reassortment of Lassa and Mopeia viruses. Lukashevich, I.S., Patterson, J., Carrion, R., Moshkoff, D., Ticer, A., Zapata, J., Brasky, K., Geiger, R., Hubbard, G.B., Bryant, J., Salvato, M.S. J. Virol. (2005)