Hundreds of people have been infected with the H5N1 virus since 2003 but, until now, they have all caught it from birds. The current bird flu outbreak in the States has seen herds of dairy farm cows infected in nine states.
Hundreds of people have been infected with the H5N1 virus since 2003 but, until now, they have all caught it from birds. The current bird flu outbreak in the States has seen herds of dairy farm cows infected in nine states.
All what you’re saying is correct, but the original sentence didn’t mention species. It mentioned mammals, and to say “from humans to mammals” is a strange phrase. It’s like saying “from liquid water to liquids.”
A correct way to say it is “transmitted to humans from other mammals.”