---
title: "Baloxavir-Based Combination Therapy Protects Mice from Influenza A(H5N1) Clade 2.3.4.4b"
id: "pubmed-42811476"
canonical_url: "https://medichelpline.com/clinical-feed/pubmed-42811476"
content_type: "clinical_feed_article"
specialty: "Pharmacology"
source_name: "PubMed / NCBI"
source_url: "https://pubmed.ncbi.nlm.nih.gov/42811476/"
doi: "10.3201/eid3210.260186"
published_at: "2026-10-01T00:00:00.000Z"
evidence_level: "Journal Article"
license: "CC-BY-NC-4.0 / Informational Use"
---
# Baloxavir-Based Combination Therapy Protects Mice from Influenza A(H5N1) Clade 2.3.4.4b
## Provenance & Clinical Metadata
- **Canonical URL:** https://medichelpline.com/clinical-feed/pubmed-42811476
- **Specialty:** [Pharmacology](https://medichelpline.com/clinical-feed/pharmacology.md)
- **Primary Source:** PubMed / NCBI
- **Source URL:** [Original Journal Publication](https://pubmed.ncbi.nlm.nih.gov/42811476/)
- **DOI:** [10.3201/eid3210.260186](https://doi.org/10.3201%2Feid3210.260186)
- **Published At:** 2026-10-01T00:00:00.000Z
- **Evidence Rating:** Journal Article
## Executive GIST (TL;DR)
- This study used a lethal mouse model of infection with highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b to evaluate antiviral treatments. - Researchers compared monotherapies with **oseltamivir**, **baloxavir**, and **molnupiravir** against two-drug combination regimens. - **Baloxavir-based combinations** outperformed single agents on key outcomes: they improved survival in infected mice, lowered **lung viral loads**, and prevented spread of virus beyond the respiratory tract. - The findings indicate that combining antivirals that include **baloxavir** may offer superior protection against severe H5N1 disease in this animal model. - Results support the incorporation of baloxavir-containing combinations into **H5N1 preparedness** strategies, though the abstract does not report specific dosing regimens, timing, statistical measures, or adverse-event data. - The study emphasizes antiviral combination therapy as a potential approach to reduce mortality and extrapulmonary dissemination during zoonotic outbreaks of highly pathogenic influenza. - Keywords associated with the work include H5N1 subtype, influenza, baloxavir, drug combinations, molnupiravir, oseltamivir, zoonoses, and respiratory infections. - The report is presented as a preclinical evaluation in mice; direct clinical implications for humans are not provided in the abstract and would require further study.
## Clinical Analysis & Structured Key Points
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Emerg Infect Dis. 2026 Oct. Show details Display options Display options Format Abstract PubMed PMID Emerg Infect Dis Actions * [ Search in PubMed ](https://pubmed.ncbi.nlm.nih.gov/?term=%22Emerg+Infect+Dis%22%5Bjour%5D&sort=date&sort_order=desc) * [ Search in NLM Catalog ](https://www.ncbi.nlm.nih.gov/nlmcatalog?term=%22Emerg+Infect+Dis%22%5BTitle+Abbreviation%5D) * [ Add to Search ](https://pubmed.ncbi.nlm.nih.gov/42811476/) . 2026 Oct;32(10):1730-1735. doi: 10.3201/eid3210.260186. ### Authors [Seong Cheol Min](https://pubmed.ncbi.nlm.nih.gov/?term=Min+SC&cauthor_id=42811476), [Ju Ryeong Lee](https://pubmed.ncbi.nlm.nih.gov/?term=Lee+JR&cauthor_id=42811476), [Beom Kyu Kim](https://pubmed.ncbi.nlm.nih.gov/?term=Kim+BK&cauthor_id=42811476), [Ji-Hyun Park](https://pubmed.ncbi.nlm.nih.gov/?term=Park+JH&cauthor_id=42811476), [Dong Gyu Lee](https://pubmed.ncbi.nlm.nih.gov/?term=Lee+DG&cauthor_id=42811476), [Gi Chan Lee](https://pubmed.ncbi.nlm.nih.gov/?term=Lee+GC&cauthor_id=42811476), [Se Hee An](https://pubmed.ncbi.nlm.nih.gov/?term=An+SH&cauthor_id=42811476), [Santosh Chokkakula](https://pubmed.ncbi.nlm.nih.gov/?term=Chokkakula+S&cauthor_id=42811476), [Aman Jain](https://pubmed.ncbi.nlm.nih.gov/?term=Jain+A&cauthor_id=42811476), [Young Ki Choi](https://pubmed.ncbi.nlm.nih.gov/?term=Choi+YK&cauthor_id=42811476), [Yun Hee Baek](https://pubmed.ncbi.nlm.nih.gov/?term=Baek+YH&cauthor_id=42811476), [Min-Suk Song](https://pubmed.ncbi.nlm.nih.gov/?term=Song+MS&cauthor_id=42811476) * PMID: **42811476** * DOI: [ 10.3201/eid3210.260186 ](https://doi.org/10.3201/eid3210.260186) Item in Clipboard Cite Display options Display options Format Abstract PubMed PMID Linked Discoveries ## Abstract Highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus continues to cause animal outbreaks and sporadic zoonotic infections. In a mouse model of lethal influenza disease, we compared oseltamivir, baloxavir, and molnupiravir monotherapies with 2-drug combinations. Baloxavir-based combinations improved survival, reduced lung viral loads, and prevented extrapulmonary dissemination, supporting H5N1 preparedness strategies. **Keywords:** H5N1 subtype; Influenza; baloxavir; drug combinations; influenza A virus; molnupiravir; oseltamivir; respiratory infections; viruses; zoonoses. [PubMed Disclaimer](https://pubmed.ncbi.nlm.nih.gov/disclaimer/) ## Similar articles * [ Baloxavir improves disease outcomes in mice after intranasal or ocular infection with Influenza A virus H5N1-contaminated cow's milk. ](https://pubmed.ncbi.nlm.nih.gov/40097765/) Jones JC, Andreev K, Fabrizio TP, Bowman AS, Govorkova EA, Webby RJ.Jones JC, et al.Nat Microbiol. 2025 Apr;10(4):836-840. doi: 10.1038/s41564-025-01961-5. Epub 2025 Mar 17.Nat Microbiol. 2025.PMID: 40097765 * [ Efficacy of Oseltamivir Against Seasonal Influenza H1N1 and the Efficacy of a Novel Combination Treatment In Vitro and In Vivo in Mouse Studies. ](https://pubmed.ncbi.nlm.nih.gov/41116245/) Liu D, Leung KY, Zhang R, Lam HY, Fan Y, Xie X, Chan WM, To KK, Chan KH, Hung IF.Liu D, et al.Influenza Other Respir Viruses. 2025 Oct;19(10):e70176. doi: 10.1111/irv.70176.Influenza Other Respir Viruses. 2025.PMID: 41116245Free PMC article. * [ Effectiveness of baloxavir marboxil in nonhuman primates infected with highly pathogenic avian influenza A(H7N9) virus. ](https://pubmed.ncbi.nlm.nih.gov/42349254/) Iwatsuki-Horimoto K, Imai M, Ishibashi T, Yamada S, Kiso M, Ito M, Yasuhara A, Yamayoshi S, Kawaoka Y.Iwatsuki-Horimoto K, et al.EBioMedicine. 2026 Jul;129:106350. doi: 10.1016/j.ebiom.2026.106350. Epub 2026 Jun 25.EBioMedicine. 2026.PMID: 42349254Free PMC article. * [ Baloxavir marboxil: the new influenza drug on the market. ](https://pubmed.ncbi.nlm.nih.gov/30852344/) O'Hanlon R, Shaw ML.O'Hanlon R, et al.Curr Opin Virol. 2019 Apr;35:14-18. doi: 10.1016/j.coviro.2019.01.006. Epub 2019 Mar 8.Curr Opin Virol. 2019.PMID: 30852344Review. * [ Clinical efficacy and Safety of Baloxavir Marboxil compared with Oseltamivir against influenza virus in children: A systematic review and meta-analysis. ](https://pubmed.ncbi.nlm.nih.gov/40549724/) Zhu L, Zhong L, Huang G.Zhu L, et al.PLoS One. 2025 Jun 23;20(6):e0326777. doi: 10.1371/journal.pone.0326777. eCollection 2025.PLoS One. 2025.PMID: 40549724Free PMC article. 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