AI Summary

A new study shows that only ten viral particles of the H5N1 bird flu can infect dairy cattle. The research suggests the virus prefers cow mammary glands over airways, which may explain why outbreaks have been hard to control. Tests found no evidence of spread through milk machinery, calf feeding, or shared indoor air between birds and cattle. Scientists are still investigating the transmission pathways, and no evidence‑based prevention recommendations are available yet. The findings are published in Nature Communications.

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