AdvertisementWhy scientists' fears about bird flu are intensifyingPlay13:18Download AudioJanuary 28, 2025Regina G. BarberWill StoneRachel CarlsonRebecca RamirezfacebookEmailAccording to the Centers for Disease Control and Prevention, there have been 67 confirmed human cases of the H5 bird flu since the 2024 outbreak began. (Finley Delouche/Getty Images)