President Bush: The policy decisions for a President in dealing with an avian flu outbreak are difficult. One example: If we had an outbreak somewhere in the United States, do we not then quarantine that part of the country, and how do you then enforce a quarantine? When -- it's one thing to shut down airplanes; it's another thing to prevent people from coming in to get exposed to the avian flu. And who best to be able to effect a quarantine? One option is the use of a military that's able to plan and move.

Source: White House Press Conference