{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:53:06Z","timestamp":1787014386033,"version":"build-2736575974"},"reference-count":38,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2012,11,5]],"date-time":"2012-11-05T00:00:00Z","timestamp":1352073600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Influenza Resp Viruses"],"published-print":{"date-parts":[[2013,9]]},"abstract":"<jats:p>\n                    <jats:italic>Please cite this paper as:<\/jats:italic>\n                    Schanzer\n                    <jats:italic>et\u00a0al<\/jats:italic>\n                    . (2012) Statistical estimates of respiratory admissions attributable to seasonal and pandemic influenza for Canada. Influenza and Other Respiratory Viruses DOI: 10.1111\/irv.12011.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Background\u2002<\/jats:bold>\n                    The number of admissions to hospital for which influenza is laboratory confirmed is considered to be a substantial underestimate of the true number of admissions due to an influenza infection. During the 2009 pandemic, testing for influenza in hospitalized patients was a priority, but the ascertainment rate remains uncertain.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Methods\u2002<\/jats:bold>\n                    The discharge abstracts of persons admitted with any respiratory condition were extracted from the Canadian Discharge Abstract Database, for April 2003\u2013March 2010. Stratified, weekly admissions were modeled as a function of viral activity, seasonality, and trend using Poisson regression models.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Results\u2002<\/jats:bold>\n                    An estimated 1 out of every 6\u00b74 admissions attributable to seasonal influenza (2003\u2013April 2009) were coded to J10 (influenza virus identified). During the 2009 pandemic (May\u2013March 2010), the influenza virus was identified in 1 of 1\u00b76 admissions (95% CI, 1\u00b75\u20131\u00b77) attributed to the pandemic strain. Compared with previous H1N1 seasons (2007\/08, 2008\/09), the influenza\u2010attributed hospitalization rate for persons &lt;65\u2003years was approximately six times higher during the 2009 H1N1 pandemic, whereas for persons 75\u2003years or older, the pandemic rate was approximately fivefold lower.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Conclusions\u2002<\/jats:bold>\n                    Case ascertainment was much improved during the pandemic period, with under ascertainment of admissions due to H1N1\/2009 limited primarily to patients with a diagnosis of pneumonia.\n                  <\/jats:p>","DOI":"10.1111\/irv.12011","type":"journal-article","created":{"date-parts":[[2012,11,5]],"date-time":"2012-11-05T04:11:10Z","timestamp":1352088670000},"page":"799-808","source":"Crossref","is-referenced-by-count":39,"title":["Statistical estimates of respiratory admissions attributable to seasonal and pandemic influenza for Canada"],"prefix":"10.1111","volume":"7","author":[{"given":"Dena L.","family":"Schanzer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Allison","family":"McGeer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kathleen","family":"Morris","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,11,5]]},"reference":[{"key":"e_1_2_9_2_2","doi-asserted-by":"publisher","DOI":"10.2307\/4591848"},{"key":"e_1_2_9_3_2","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2334-11-90"},{"key":"e_1_2_9_4_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1750-2659.2008.00035.x"},{"key":"e_1_2_9_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.vaccine.2008.06.087"},{"key":"e_1_2_9_6_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pmed.0050211"},{"key":"e_1_2_9_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.vaccine.2006.09.041"},{"key":"e_1_2_9_8_2","doi-asserted-by":"publisher","DOI":"10.1001\/jama.289.2.179"},{"key":"e_1_2_9_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0264-410X(99)00099-7"},{"key":"e_1_2_9_10_2","doi-asserted-by":"publisher","DOI":"10.1086\/425315"},{"key":"e_1_2_9_11_2","doi-asserted-by":"publisher","DOI":"10.3201\/eid1609.091723"},{"key":"e_1_2_9_12_2","doi-asserted-by":"publisher","DOI":"10.1017\/S0950268800031034"},{"key":"e_1_2_9_13_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0006681"},{"key":"e_1_2_9_14_2","unstructured":"World Health Organization.Comparing deaths from pandemic and seasonal influenza: Pandemic (H1N1) 2009 briefing note 20. Available athttp:\/\/www.who.int\/csr\/disease\/swineflu\/notes\/briefing_20091222\/en\/index.html2009; (Accessed 26 April 2010)."},{"key":"e_1_2_9_15_2","doi-asserted-by":"publisher","DOI":"10.3201\/eid1512.091413"},{"key":"e_1_2_9_16_2","unstructured":"European Scientific Working group on Influenza (ESWI).Fourth ESWI Influenza Conference in Malta (11\u201314 September 2011). Available athttp:\/\/www.eswiconference.org\/Downloads\/Press\u2010release\u2010Malta.aspx(Accessed 2 May 2012)."},{"key":"e_1_2_9_17_2","unstructured":"Discharge Abstract Database. 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