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}}</ref> This study among others forms the basis of a recommendation that people whose jobs involve handling poultry and swine be the focus of increased public health surveillance.<ref name="pmid19276439"/> The [[2009 swine flu outbreak]] is an apparent [[reassortment]] of several strains of [[influenza A virus subtype H1N1]], including a strain [[human influenza|endemic in humans]] and two strains endemic in pigs, as well as an [[avian influenza]].<ref name="NewSci-20090424-pandemic">{{cite news|url=http://www.newscientist.com/article/dn17025-deadly-new-flu-virus-in-us-and-mexico-may-go-pandemic.html|title=Deadly new flu virus in US and Mexico may go pandemic|work=[[New Scientist]]|date=2009-04-24|accessdate=2009-04-26}}</ref>
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{{cite web
|url=http://www.cdc.gov/swineflu/key_facts.htm
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