Influenza activity in the world

19 March 2010

This summary provides an updated summary of both pandemic influenza A (H1N1) 2009 virus and seasonal influenza activity for weeks 7-8 of 2010 (as of 19 March 2010). Detailed reports of the pandemic influenza A (H1N1) virus activity are available at: the WHO page for Pandemic (H1N1) 2009 . This summary does not include reports of avian influenza in humans, which are available at: the WHO avian influenza page .

Pandemic (H1N1) 2009

During weeks 7-8, pandemic influenza A (H1N1) 2009 virus activity continued to decrease in most countries and was not the predominant circulating virus reported in a number of countries in Asia and the Middle East. China, China Hong Kong Special Administrative Region, Iran (Islamic Republic of) and Mongolia all reported influenza B as the predominant virus.

Regional outbreaks of pandemic influenza A (H1N1) 2009 activity were reported in Armenia, Austria, China, Greece, Italy, Mongolia and Peru. Local levels of pandemic influenza A (H1N1) 2009 activity were reported in Argentina, Brazil, Cambodia, Ghana, Japan, Republic of Moldova, Russian Federation, Senegal and United States of America.

Sporadic pandemic influenza A (H1N1) 2009 activity was reported in Algeria, Australia, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Cameroon, Canada, Chile, China Hong Kong Special Administrative Region, Croatia, Czech Republic, Denmark, Estonia, France, Germany, Georgia, Hungary, Indonesia, Iran (Islamic Republic of), Israel, Italy, Kenya, Kyrgyzstan, Latvia, Lithuania, Luxembourg, Madagascar, Malta, Mexico, Montenegro, Norway, Poland, Portugal, Republic of Korea, Romania, Rwanda, Serbia, South Africa, Spain, Sweden, Switzerland, Thailand, Uganda, Ukraine, United Kingdom and Zambia.

Seasonal influenza

Influenza B activity was high in China, China Hong Kong Special Administrative Region, Iran (Islamic Republic of), Mongolia and increasing in the Russian Federation and Sweden. Influenza H1N1 and H3N2 was also detected at low levels in China. Sporadic seasonal influenza activity was observed in Algeria (H3), Angola (B), Australia (H3,B), Canada (B), China Hong Kong Special Administrative Region (H3,B), Cameroon (B), Ghana (H3), Iran (Islamic Republic of) (B), Japan (H3,B), Latvia (B), Kenya (B), Poland (B), Romania (B), Russian Federation (H1,H3,B), Senegal (H1), Spain (B), Sweden (B), Thailand (H3,B), Uganda (H3,B), Ukraine (B), United Kingdom (B), United Republic of Tanzania (H3,B), United States of America (H3,B) and Zambia (H1,B).

Armenia, Azerbaijan, Bolivia (Plurinational State of), Central African Republic, El Salvador, Ethiopia, France - New Caledonia, Mozambique, Netherlands, New Zealand, Panama, Slovakia, Slovenia, The former Yugoslav Republic of Macedonia, Tunisia and Uzbekistan reported no influenza activity.