H1N1 in post-pandemic period
The world is no longer in phase 6 of influenza pandemic alert. We are now moving into the post-pandemic period. The new H1N1 virus has largely run its course.
In the post-pandemic period, localized outbreaks of different magnitude may show significant levels of H1N1 transmission. Globally, the levels and patterns of H1N1 transmission now being seen differ significantly from what was observed during the pandemic. Out-of-season outbreaks are no longer being reported in either the northern or southern hemisphere. Influenza outbreaks, including those primarily caused by the H1N1 virus, show an intensity similar to that seen during seasonal epidemics.
During the pandemic, the H1N1 virus crowded out other influenza viruses to become the dominant virus. This is no longer the case. Many countries are reporting a mix of influenza viruses, again as is typically seen during seasonal epidemics.
Pandemics, like the viruses that cause them, are unpredictable. So is the immediate post-pandemic period. Continued vigilance is extremely important, and WHO has issued advice on recommended surveillance, vaccination, and clinical management during the post-pandemic period.
Source: Extracts from Director-General's statement of WHO posted on WHO website on 10 August 2010
Hotlink to the map of human swine influenza affected areas as published by International SOS: