A picture shoes an airport thermal camera system monitoring the body heat of passengers arriving from abroad is displayed at Sofia airport in this April 29, 2009 file photo. Bulgaria confirmed its first case of H1N1 flu, in a man who had recently returned from the United States, the Health Ministry said on June 1, 2009. REUTERS/Stoyan Nenov/Files (BULGARIA HEALTH SOCIETY)
REUTERS/STOYAN NENOV