title: The new influenza A H1N1 virus: balancing on the interface of humans and animals.
abstract: In the spring of 2009, a new human influenza A H1N1 virus emerged in Mexico and the United States. The strain was referred to as "swine flu" as it has strong similarities with current circulating swine influenza viruses, although the first outbreak on a swine farm was recorded more than 2 mo following the first human reports. This new strain, designated as pandemic (H1N1) 2009, has shown the ability to spread amongst the human population and can be found on all continents. The way influenza viruses and specifically this influenza A pandemic (H1N1) 2009 virus evolve is described in this manuscript.
authors.affiliation: Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta T2N 4N1. frank.vandermeer@ucalgary.ca
authors.forename: Frank J U M
authors.initials: FJ
authors.lastname: van der Meer
authors.forename: Karin
authors.initials: K
authors.lastname: Orsel
authors.forename: Herman W
authors.initials: HW
authors.lastname: Barkema
mesh_terms: D000818:Animals; D001717:Birds; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000145:classification / Q000235:genetics; D005585:Influenza in Birds / Q000453:epidemiology / Q000635:transmission / Q000821:virology*; D007251:Influenza, Human / Q000453:epidemiology / Q000635:transmission / Q000821:virology*; D009976:Orthomyxoviridae Infections / Q000453:epidemiology / Q000635:transmission / Q000662:veterinary* / Q000821:virology; D013045:Species Specificity