Over the past four years, the United States has had 553 flu-associated child deaths. Canada has had 16 flu-related deaths of children. Where does the difference lie?
It may have something to do with a Canadian study done in 2009 that showed that those who had a regular flu shot were twice as likely to catch swine flu. After this research came out, some provinces in Canada suspended seasonal flu shots for those under 65, and did some more studies.
Vitamin D has been looking more and more like a champion as more research is being done. One study involving 19,000 Americans found that people with the lowest levels of vitamin D in their blood also had more colds and flu than people with higher levels of vitamin D.
"The vast majority of so-called 'flu deaths' are in fact due to bacterial pneumonia -- a potential complication of the flu if your immune system is too weak. Other complications can include ear- or sinus infections, dehydration, and worsening of chronic health conditions."
http://articles.mercola.com/sites/articles/archive/2010/07/03/canada-virtually-eliminates-flu-deaths-while-us-has-thousands.aspx