Viral-research moratorium called too broad

U.S. researchers are worried that a temporary government ban on ?gain-of-function? experiments that boost the infectious properties of dangerous viruses may also cover less-extreme forms of the work that are crucial to protecting public health. At a public meeting of the National Science Advisory Board for Biosecurity (NSABB) in Bethesda, Maryland, on 22 October, researchers complained that development of seasonal influenza vaccines and antiviral drugs might be hampered by the move.