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As we enter the post A/H1N1 flu pandemic stage, let's take a look at the background to the disease.
The A/H1N1 virus was first identified in Mexico in April 2009. After six weeks, the virus had spread all over the world. In June 2009, the World Health Organization raised its alert to the highest level, marking the official outbreak of a pandemic. The disease caused widespread panic last winter.
So far, about 214 countries and regions have reported laboratory-confirmed cases of the flu, which have resulted in more than 18,000 deaths.
According to the WHO, more than 350 million people in the world have been vaccinated against it.
While announcing the post-pandemic period, WHO Director-General Margaret Chan is warning that the A/H1N1 virus will continue to spread as a seasonal flu for some years to come.
- WHO declares end of H1N1 pandemic 2010-08-11