GYPC and Lassa fever: Here, we assess the ability of antibodies from Nigerian Lassa fever survivors exposed to LASV lineages II and III and Sierra Leonean Lassa fever survivors exposed to LASV lineage IV to cross-react with recombinant NP, GP and Z proteins representing LASV of these divergent lineages and to cross-neutralize pseudoviruses expressing LASV GPC of these divergent lineages.