Gerd Burchard, head medic of the infection section at the UKE hospital, speaks during a news conference on the developments of the swine flu at the at the UKE clinic in Hamburg April 29, 2009. Germany's infectious diseases agency found swine flu in a man and a woman in their late 30s in Bavaria, and a 22-year-old woman in Hamburg at the other end of the country, all of whom had recently returned from Mexico. The World Health Organization has raised its alert level to indicate a significantly increased risk of pandemic, or global outbreak of serious illness. REUTERS/Christian Charisius (GERMANY ENVIRONMENT HEALTH HEADSHOT)
REUTERS/Christian Charisius