H7N9 bird flu

Nepalese health workers carry sacks of dead chickens at a poultry farm with a suspected bird flu outbreak in Nangkhel village on the outskirts of Kathmandu on Aug. 1, 2013. (credit: PRAKASH MATHEMA/AFP/Getty Images)

Scientists Plan Controversial Lab-Made H7N9 Bird Flu That’s Killed Dozens

Scientists who sparked an outcry by creating easier-to-spread versions of the bird flu for research purposes want to try such experiments again using a worrisome new strain. This time around, the U.S. government is promising extra scrutiny of such high-stakes research up front.