After a new study showed that bird flu has spread to dairy farm workers more often than previously known, the US Centers for Disease Control and Prevention is expanding its recommendations for testing and treatment of workers on farms where animals have tested positive.

Dairy workers who’ve been exposed to bird flu should be tested for the virus even if they don’t have symptoms and be offered Tamiflu to cut their risk of getting sick, the Centers for Disease Control and Prevention said Thursday. The recommendation ...

By Grace WadeThere may be more bird flu cases in humans in the US than we previously thought. Health departments in two states took blood tests of workers on dairy farms known to have hosted infected cattle and found that about 7 per cent of them have antibodies for the disease.