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California Case Suggests Tamiflu May Save Cats Infected with H5N1 Bird Flu

University of Maryland study shows early antiviral treatment with oseltamivir helped cats survive H5N1 infection and develop strong immunity months after recovery.

  • Recently, University of Maryland researchers published a One Health paper reporting cats infected with H5N1 survived when treated promptly with oseltamivir .
  • The Tulare household, near infected dairy farms, first brought a sick cat to a clinic on October 31, 2024, and returned on Nov. 6–7 with two more sick cats, amid H5N1 outbreaks .
  • Cat 3 was started on 15 mg oseltamivir every 12 hours for 10 days alongside Meloxicam and subcutaneous fluids, while Cat 2 received 200 mL Lactated Ringers and cefovecin sodium.
  • Owners reported the treated domestic cats recovered and were back to normal, and experts warned early intervention can prevent euthanasia while infected cats pose spillover risks to family members and veterinary teams.
  • The study found survivor cats kept high antibody levels for months, maintaining neutralizing antibodies against H5N1 2.3.4.4b at least 3–4 months post recovery, and Kristen K. Coleman said antiviral medications could limit spread and reinfection.
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California case suggests Tamiflu may save cats infected with H5N1 bird flu

By Susanne Rust, Los Angeles Times LOS ANGELES — Since the avian flu arrived en force in California’s dairy industry in 2024, not only has it sickened cows, it has killed hundreds of domestic cats. Some pet cats that live on dairy farms were infected with the H5N1 virus by drinking raw milk. Both pets and feral barn cats got sick after eating raw pet food that harbored the virus. Still others got it by eating infected wild birds, rats or mice, o…

·Saint Paul, United States
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Truth about Pet Food broke the news in on Wednesday, October 1, 2025.
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