The potential use of influenza virus as an agent for bioterrorism.

Influenza A virus has been responsible for widespread human epidemics because it is readily transmitted from humans to humans by aerosol. Recent events have highlighted the potential of influenza A virus as a bioterrorist weapon: the high virulence of the influenza A virus that infected people in Hong Kong in 1997; and the development of laboratory methods to generate influenza A viruses by transfection of DNAs without a helper virus. Antiviral drugs that are directed at functions shared by all influenza A viruses constitute the best line of defense against a bioterrorist attack. Consequently, new antiviral drugs need to be developed, and the few currently available antiviral drugs should be stockpiled.