— There's been a flurry of activity around medical countermeasures in the last yearEmergency nuclear response programs across several federal agencies have been quietly updating existing preparedness plans in recent months, but one expert warned that the U.S. is still not ready for a potential radiological disaster. With occasional news reportsopens in a new tab or window of hostile nuclear-armed nationsopens in a new tab or window and summer blockbusters -- like "Oppenheimer" -- re-stoking fears of nuclear fallout, dozens of federal and local government agencies have engaged in efforts to address potential shortfalls or gaps in preparedness planning for...