LEP and leprosy: LepVax (LEP-F1 adjuvanted with GLA-SE), a leprosy candidate vaccine (Duthie et al., 2020a) was formulated with a fusion protein LEP-F1 (named ML89 during preclinical development; comprised of ML2351, ML2055, ML2380, and ML2028 antigens) combined with GLA-SE.