H5N1 Bird Flu's Hidden Weeks in Dairy Cattle Revealed by Unusual Symptoms
When H5N1 bird flu first began infecting U.S. cattle in early 2024, diagnosis was elusive because, in cows, the disease looked completely different. Instead of affecting the lungs, as H5N1 does in other mammalian species, it caused severe infection in the cows' udders, largely sparing the lungs.
The initial spread of H5N1 bird flu among U.S. dairy cattle in early 2024 went largely undetected for weeks due to the disease presenting with atypical symptoms. Unlike its typical respiratory effects in other mammals, the virus primarily caused severe infections in the cows' udders, sparing their lungs. This unusual presentation made early diagnosis challenging. The distinct manifestation in cattle highlights the virus's adaptability and the complexities of disease surveillance. Understanding these atypical presentations is crucial for effective outbreak management.
This discovery reveals how H5N1 adapted to infect cattle, highlighting the importance of recognizing novel disease presentations in animal populations.
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