Around 3.7 million people in England have been vaccinated against H1N1 flu, according to the World Health organization (WHO), who also urged anyone in priority groups to have the shot now to ward off the virus in 2010.
According to the Chief Medical Officer while the second wave of H1N1 was now ending in Britain, risks remained for the 2010 winter flu season.
Although it has not been a severe illness for most people, children and younger adults have developed serious complications, been admitted to hospital and some have died. When the virus returns in the 2010 flu season, those who develop complications or die will be doing so from a vaccine preventable disease.
U.S. health officials estimate that around 62 million Americans have received H1N1 shots and Chinese health experts told the WHO this week that a similar number had been vaccinated against the virus in China. The WHO says almost 14,000 official H1N1 flu deaths have been reported by more than 200 countries.
Of the 3.7 million vaccines given, around 387,000 were to health and social-care workers, 132,000 to pregnant women, and 214,000 to children.
A study conducted by researchers from Britain showed that one child in every three caught H1N1 flu in the first wave of infection in hard-hit areas of England in August, July, and, September 2009 - up to 10 times more than originally thought.
Britain, like many other countries, has cut back its orders of H1N1 vaccines because only one dose is needed, rather than the two original thought, and the pandemic appears to be not as deadly as feared.