Pandemic H1N1 2009 The most active areas of pandemic influenza transmission currently are in central and eastern European countries. A high intensity of respiratory diseases activity (51) concurrent circulation of pandemic influenza still (52) parts of southern and eastern Europe, (53) in Greece, Poland, and Ukraine. In Western Europe, influenza (54) remains active and widespread, but overall disease activity has peaked. All influenza viruses in Western Europe were pandemic H 1N1 2009, however, very small (55) of seasonal influenza viruses, covering less than 1% of all influenza viruses (56) , were reported in Russia. (57) , limited available data indicate that active, high intensity transmission is occurring in Northern African countries (58) the Mediterranean coast. In Central Asia, limited data (59) that influenza virus circulation remains active, but transmission may have recently peaked in some places. In West Asia, Israel, Iran, and Iraq also appear (60) their peak period of transmission within the past month, though (61) areas continue to have some active transmission and levels of respiratory disease activity have not yet returned to baseline levels. In East Asia, influenza transmission remains active but appears to be (62) overall. (63) increases in ILI were reported in Mongolia after weeks of declining activity following a large peak of activity over one month ago. In North America, influenza transmission (64) widespread but has declined quickly in all countries. In the tropical regions of Central and South America and the Caribbean, influenza transmission remains geographically widespread but overall disease activity has been declining or remains unchanged in most parts, (65) focal increases in respiratory disease activity in a few countries.