A quarantine officer monitors travellers with a thermographic device at an arrival gate at the Suvarnabhumi airport in Bangkok on 27 April, 2009. Thailand set up thermal scanners at Bangkok's main airport and halted pork product imports from Mexico and the United States as authorities acted against the spread of swine flu. AFP PHOTO / NICOLAS ASFOURI (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)