{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T17:05:44Z","timestamp":1790874344131,"version":"4.1.0"},"posted":{"date-parts":[[2026,9,28]]},"group-title":"Microbiology","reference-count":51,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T00:00:00Z","timestamp":1790553600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,9,28]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                <jats:p>\n                  Mosquito-transmitted alphaviruses, including chikungunya (CHIKV), Mayaro, Eastern equine encephalitis, and Venezuelan equine encephalitis viruses, cause severe arthritic or neurologic disease in humans. There are currently no approved antiviral treatments against alphavirus infection. Here, we report that the purine ribonucleoside EIDD-3525 is a potent inhibitor of alphavirus replication\n                  <jats:italic>in vitro<\/jats:italic>\n                  with broad spectrum antiviral activity against the\n                  <jats:italic>Alphavirus<\/jats:italic>\n                  genus. Using a trans-replicase assay, we find that EIDD-3525 blocks alphavirus RNA replication. Mutational profiling suggests that EIDD-3525 targets the alphavirus nsP4 RNA-dependent RNA polymerase that is conserved across medically important alphaviruses. In a pre-clinical mouse model of CHIKV infection and disease, oral treatment with EIDD-3525 reduced viral tissue burdens and the severity of virus-induced disease. Collectively, our findings support the continued development of the purine ribonucleoside EIDD-3525 as an orally available antiviral therapeutic for use against a broad group of alphaviruses.\n                <\/jats:p>","DOI":"10.64898\/2026.09.26.754626","type":"posted-content","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T04:30:18Z","timestamp":1790656218000},"source":"Crossref","is-referenced-by-count":0,"title":["EIDD-3525 is a broad-spectrum antiviral against alphavirus infection that targets the nsP4 RNA-dependent RNA polymerase"],"prefix":"10.64898","author":[{"given":"Peiqi","family":"Yin","sequence":"first","affiliation":[{"name":"Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, USA, 10461"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shweta","family":"Choudhary","sequence":"additional","affiliation":[{"name":"Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado, USA, 80045"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sainan","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Bioengineering, University of Tartu, Tartu, Estonia, 50090"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8155-191X","authenticated-orcid":false,"given":"Bennett J.","family":"Davenport","sequence":"additional","affiliation":[{"name":"Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado, USA, 80045"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Phong M.","family":"Truong","sequence":"additional","affiliation":[{"name":"Emory Institute for Drug Development (EIDD), Atlanta, Georgia, USA 30322"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zachary M.","family":"Sticher","sequence":"additional","affiliation":[{"name":"Emory Institute for Drug Development (EIDD), Atlanta, Georgia, USA 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