--- title: 'Agriculture Daily Summary: What Happened on October 28, 2026' headline: mRNA vaccine reduced H5N1 levels in milk in an eight-cow study description: Researchers also found less disease after viral challenge, but tested the vaccine in only four cows. url: https://thebench.bio/news/agriculture/2026-10-28 topic: agriculture date: '2026-10-28' covers: - '2026-10-28' date_published: '2026-10-28T12:03:51Z' date_modified: '2026-10-28T12:03:51Z' tags: - Industry sources: 1 publisher: TheBench.Bio --- # Agriculture Daily Summary: What Happened on October 28, 2026 **mRNA vaccine reduced H5N1 levels in milk in an eight-cow study** Researchers also found less disease after viral challenge, but tested the vaccine in only four cows. ## Today in brief After H5N1 challenge, vaccinated cows had about 1,000-fold lower peak viral RNA levels in milk than controls. [1] The study included four vaccinated cows and four saline-treated controls. [1] ## Also worth knowing - Vaccinated cows also had less mastitis and mammary fibrosis after H5N1 challenge, and researchers reported no obvious adverse effects. [1] ## The day in numbers - **About 1,000-fold**: Lower peak viral RNA in milk among vaccinated cows after challenge, compared with controls. [1] - **8 cows**: Four received two vaccine doses and four received saline. [1] ## Sources 1. [An mRNA–lipid nanoparticle vaccine against H5N1 influenza virus protects lactating dairy cows from infection](), Nature Biotechnology, 2026-10-28 --- TheBench.Bio wrote this from the reporting cited above, with a language model drafting and editing. [1]: