INCHEON, SOUTH KOREA - APRIL 28:  A South Korean quarantine officer monitors a thermal scanner as passengers from an international flight arrive at Incheon International Airport on April 28, 2009 in Incheon, South Korea. 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 Song Kyung-Seok - Pool/Getty Images)