Influenza A (H1N1) viruses have been widely found in different species, hence different strains have been demonstrated to infect various species such as birds, pigs and humans. During this year a new influenza virus has recently emerged from a reassortment between triple reassortant swine virus and the Eurasian influenza A swine virus lineage.1 Since the World Health Organisation’s declaration of a new pandemic, the virus has continued to spread to different countries, with a higher number of cases in North and South America, of which Chile has emerged as one of the most affected countries worldwide2 (fig 1).