Bird flu spreads to cattle from unknown sources

Recent scientific studies have unexpectedly discovered that the H5N1 avian influenza virus infects cattle and targets mammary tissue directly rather than the respiratory system. This has led to cases of acute mastitis in Texas, USA, at the beginning of 2024. The research showed that the virus propagates in the mammary tissue and releases large quantities into the milk, raising health concerns about raw, unpasteurized milk, while pasteurized milk remains safe. The findings indicated that the carbohydrate receptors favored by the virus are concentrated in the mammary glands and bypass the lungs, explaining how the virus infects cattle while avoiding respiratory infections.

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