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Volume 32, Number 8—August 2026

Dispatch

Isolation of Highly Pathogenic Avian Influenza A(H5N1) Virus from Fetal Bovine Serum, United States, 2025

Ana R. Rebelo1, Erica Butler1, Elizabeth Aguilera Nunez, Brittany Cronk, Jennifer Powers, Melissa Laverack, Chen Feng, Mohammed Nooruzzaman, Mia K. Torchetti, Leonardo C. Caserta, and Diego G. DielComments to Author 
Author affiliation: Cornell University College of Veterinary Medicine, Ithaca, New York, USA (A.R. Rebelo, E. Butler, E. Aguilera Nunez, B. Cronk, J. Powers, M. Laverack, C. Feng, M. Nooruzzaman, L.C. Caserta, D.G. Diel); US Department of Agriculture Animal and Plant Health Inspection Service, Ames, Iowa, USA (M.K. Torchetti)

Main Article

Figure 2

Cytopathic effects of highly pathogenic avian influenza A (H5N1) virus in Vero cells isolated from fetal bovine serum, United States, 2025. Vero cells inoculated with non–heat-inactivated fetal bovine serum sample (046093-25-2) show cell rounding and vacuolation on day 7 of incubation. Images represent different fields of view of the same cell culture on the same day (original magnification × 20).

Figure 2. Cytopathic effects of highly pathogenic avian influenza A (H5N1) virus in Vero cells isolated from fetal bovine serum, United States, 2025. Vero cells inoculated with non–heat-inactivated fetal bovine serum sample (046093-25-2) show cell rounding and vacuolation on day 7 of incubation. Images represent different fields of view of the same cell culture on the same day (original magnification × 20).

Main Article

1These first authors contributed equally to this article.

Page created: June 01, 2026
Page updated: July 27, 2026
Page reviewed: July 27, 2026
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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