Bird flu has been spreading in dairy cows in the US-and the scale of the spread is likely to be far worse than it looks. In addition, 14 human cases have been reported in the US since March. Both are worrying developments, say virologists, who fear that the country's meager response to the virus is...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. Why virologists are getting increasingly nervous about bird flu Bird flu has been spreading in dairy cows in the US-and the scale is likely to be far worse than it looks. In addition,...