NARITA, JAPAN - APRIL 29:  Passengers come out from an airplane arriving from Mexico via Vancouver, Canada at Narita International Airport on April 29, 2009 in Narita, Japan. Swine Influenza Virus (SIV) has claimed 149 lives in Mexico with positive reports of the virus spreading to the United States of America, United Kingdom and Europe.  (Photo by Junko Kimura/Getty Images)