All you would need is one person willing to become a martyr for the cause, just like the hijackers last week were. This person would be voluntarily infected with the virus, travel to the US, sneeze on a couple of people, and a chain reaction would begin that would travel like wildfire through the population. For that matter, a terrorist in a foreign country could slip something into the food of a single unknowing person scheduled to get onto a plane to the US. There would be no need to create a bomb that would scatter the virus or to infect a municipal water supply or load a crop-duster with it or any other artifical means of broadcasting it. The scary part is that natural processes of the virus would do all that automatically by jumping from host to host one person at a time.<br><br>