We're also actively monitoring travellers at our land, sea, and air ports. We're watching them for signs of illness, and we have appropriate protocols in place to deal with those who are sick. Precautions are being taken to protect travellers and border personnel. Anyone exhibiting symptoms is being referred to an isolation room where they can be evaluated by a public health official before proceeding to their destruction.

http://www.theregister.co.uk/2009/04/30/dhs_swine_flu/