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Although H5N1 is usually associated with respiratory symptoms, infected cows lack these typical signs of the disease and develop necrotizing mastitis instead. Now researchers say they have figured out why.
Cow's respiratory tissues lack key binding sites used by the virus to infect cells, suggesting H5N1 could manifest unusual symptoms in other species.

Although H5N1 is usually associated with respiratory symptoms, infected cows lack these typical signs of the disease and develop necrotizing mastitis instead. Now researchers say they have figured out why.