Joe Biden take note.  Fresh from the World Health Organization:

WHO is not recommending travel restrictions related to the outbreak of the Influenza A (H1N1) virus. Today, international travel moves rapidly, with large numbers of individuals visiting various parts the world. Limiting travel and imposing travel restrictions would have very little effect on stopping the virus from spreading, but would be highly disruptive to the global community...Scientific research based on mathematical modelling indicates that restricting travel will be of limited or no benefit in stopping the spread of disease. Historical records of previous influenza pandemics, as well as experience with SARS, have validated this point.