A boy wearing a protective mask walks during snowfall in central Sofia November 3, 2009. Bulgaria is in a pre-epidemic situation but the quickly increasing numbers of infected people may soon force officials to declare a national epidemic. Currently, some 100,000 people are infected with the new H1N1 flu, the health ministry said. REUTERS/Stoyan Nenov (BULGARIA HEALTH ENVIRONMENT)
REUTERS/STOYAN NENOV