Costa Rica's President Oscar Arias jokes with the media after inaugurating the National Center for Biotechnology Innovations, in San Jose August 18, 2009. Arias returned to his normal routine on Tuesday, after becoming the first head of state known to be infected with the H1N1 flu virus. Reuters Pictures 3 months ago

Costa Rica's President Oscar Arias jokes with the media after inaugurating the National Center for Biotechnology Innovations, in San Jose August 18, 2009. Arias returned to his normal routine on Tuesday, after becoming the first head of state known to be infected with the H1N1 flu virus.