Epidemiological Alert: On Probable Influenza A(H1N1) 2009 Outbreaks (Published on 20 April 2011)

Since the beginning of 2011, in the region of the Americas, there have been significant outbreaks of influenza A (H1N1) 2009, that while geographically limited, have generated a significant demand on health services. This situation is not unexpected. Since the end of the pandemic (2009-2010), the influenza A (H1N1) 2009 virus, continues to circulate on a global level like a seasonal strain, periodically causing important outbreaks in various continents. Considering the possibility of outbreaks occurring on account of the influenza A (H1N1) 2009 virus in the countries of the Region, national authorities should be prepared to mitigate the resulting impact.