Following a CDC study indicating that 7% of dairy workers tested positive for antibodies to H5N1, federal health officials are revising testing recommendations to include asymptomatic workers. The study, involving 115 workers, found that many were unaware of their exposure and lacked protective gear while working. As a response, the CDC is recommending broader testing and the administration of antiviral medication, Tamiflu, to high-risk individuals. This move aims to reduce the risk of virus transmission and manage the spread of bird flu in agricultural settings.