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This rapid increase in cases over a brief time period is alarming and has raised concerns about the pandemic potential of the H7N9 virus. Three major factors influence the pandemic potential of an influenza virus: (1) its ability to cause human disease, (2) the immunity of the population to the virus, and (3) the transmission potential of the virus. This paper reviews what is currently known about each of these factors with respect to avian influenza A(H7N9). Currently, sustained human-to-human transmission of H7N9 has not been reported; however, population immunity to the virus is considered very low, and the virus has significant ability to cause human disease. Several statistical and geographical modelling studies have estimated and predicted the spread of the H7N9 virus in humans and avian species, and some have identified potential risk factors associated with disease transmission. Additionally, assessment tools have been developed to evaluate the pandemic potential of H7N9 and other influenza viruses. These tools could also hypothetically be used to monitor changes in the pandemic potential of a particular virus over time.<\/jats:p>","DOI":"10.1017\/s0950268815001570","type":"journal-article","created":{"date-parts":[[2015,7,24]],"date-time":"2015-07-24T02:03:59Z","timestamp":1437703439000},"page":"3359-3374","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":77,"title":["The pandemic potential of avian influenza A(H7N9) virus: a review"],"prefix":"10.1017","volume":"143","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7487-4136","authenticated-orcid":false,"given":"W. D.","family":"TANNER","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. J. 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