Airport official checks a thermal camera system monitoring the body heat of passengers arriving from...
An airport official checks a thermal camera system monitoring the body heat of passengers arriving from abroad at Sofia airport April 29, 2009. A global hunt for swine flu turned up new infections all around the world on Tuesday, and frightened governments warned people to stay away from Mexico, where up to 159 people have died. REUTERS/Stoyan Nenov (BULGARIA HEALTH SOCIETY)