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O’nyongnyong virus (ONNV) is a re-emerging alphavirus previously known to be transmitted by main malaria vectors, thus suggesting the possibility of coinfections with arboviruses in co-endemic areas. However, the pathological outcomes of such infections remain unknown. Using murine coinfection models, we demonstrated that a preexisting blood-stage  Plasmodium  infection suppresses ONNV-induced pathologies. We further showed that suppression of viremia and virus dissemination are dependent on  Plasmodium -induced IFNγ and are associated with reduced infection of CD45 −  cells at the site of virus inoculation. We further proved that treatment with IFNγ or plasma samples from  Plasmodium vivax –infected patients containing IFNγ are able to restrict ONNV infection in human fibroblast, synoviocyte, skeletal muscle, and endothelial cell lines. Mechanistically, the role of IFNγ in restricting ONNV infection was confirmed in in vitro infection assays through the generation of an IFNγ receptor 1 α chain (IFNγR1)–deficient cell line.

Malaria abrogates O’nyong–nyong virus pathologies by restricting virus infection in nonimmune cells