Medics tasked to test travellers arriving from the U.S. and Mexico for swine flu walk in Sheremetyevo airport in Moscow April 27, 2009. In Russia, aircraft stewards arriving from the Americas have been instructed to warn about passengers with flu-like symptoms. Planes, on which cases are suspected, should be taxied to special zones and passengers and crews examined by medics. REUTERS/Alexander Natruskin (RUSSIA HEALTH SOCIETY)
REUTERS/ALEXANDER NATRUSKIN