CDC H1N1 Flu | Novel 2009-H1N1 Flu: International Situation Update

Novel 2009-H1N1 Flu: International Situation Update
August 14, 2009, 11:00 AM ET

Map of International Activity Estimates
(Including Novel 2009-H1N1 Flu)

This situation report provides an update to the international situation as of August 14, 2009. World Health Organization (WHO) regions have reported 177,457 laboratory-confirmed cases of novel 2009-H1N1 influenza virus (new H1N1) with 1,462 deaths. The laboratory-confirmed cases represent an underestimation of total cases in the world as many countries have shifted to strategies of clinical confirmation and prioritization of laboratory testing for only persons with severe illness and/or high risk conditions. The new H1N1 influenza virus is the dominant influenza virus in circulation in the world. According to a WHO Global Influenza Surveillance Network (GISN) report dated August 4th, 71% of all influenza viruses currently detected globally are the new H1N1. The new H1N1 accounts for 66% of influenza viruses in the Northern Hemisphere and 89% of influenza viruses in the Southern Hemisphere. There are indications that disease may be decreasing in South America and part of Australia. Disease associated with new H1N1 influenza is continuing to increase in southern Africa.

Selected Highlights
The new H1N1 influenza virus is the predominate influenza virus in circulation worldwide.
The epidemiology of the disease caused by the novel 2009-H1N1 influenza virus in the Southern Hemisphere is very similar to that described in the United States this past spring.
Isolates sequenced at WHO and CDC suggest that circulating novel 2009-H1N1 influenza viruses look similar to A/California/07/2009 (the reference virus selected by WHO as a potential candidate for the new H1N1 vaccine).

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