{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T10:04:30Z","timestamp":1785578670021,"version":"3.56.0"},"reference-count":18,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2013,3,18]],"date-time":"2013-03-18T00:00:00Z","timestamp":1363564800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Medical Virology"],"published-print":{"date-parts":[[2013,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Influenza epidemics occur annually with variations in size and severity. Hospital\u2010based Influenza Morbidity &amp; Mortality was established to monitor influenza epidemics and their severity, which is composed of two surveillance systems: emergency room\u2010based and inpatient\u2010based surveillance. Regarding emergency room\u2010based surveillance, influenza\u2010like illness index (influenza\u2010like illness cases per 1,000 emergency room\u2010visiting subjects), number of laboratory\u2010confirmed cases and the distribution of influenza types were estimated weekly. Inpatient\u2010based surveillance included monitoring for hospitalization, complications, and mortality. The emergency room influenza\u2010like illness index correlated well with the number of laboratory\u2010confirmed influenza cases, and showed a bimodal peak at Week 4 (179.2\/1,000 emergency room visits) and Weeks 13\u201014 (169.6\/1,000 emergency room visits) of 2012. Influenza A was the predominant strain during the first epidemic peak, while influenza B was isolated exclusively during the second peak. In 2011\u20132012 season, the mean admission rate of emergency room\u2010visiting patients with influenza\u2010like illness was 16.3% without any increase over the epidemic period. Among the hospitalized patients with influenza, 33.6% (41 out of 122 patients) were accompanied by complications, and pneumonia (28.7%, 35 out of 122 patients) was the most common. Most fatal cases were caused by influenza A (96.2%) after the first epidemic peak. In conclusion, Hospital\u2010based Influenza Morbidity &amp; Mortality was effective for monitoring the trends in circulating influenza activity concurrently with its severity. In the 2011\u20132012 season, the influenza epidemic persisted for a \u22655\u2010month period, with a bimodal peak of influenza A and B in sequence. Overall, influenza A was more severe than influenza B. J. Med. Virol. 85:910\u2013917, 2013. \u00a9 2013 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/jmv.23548","type":"journal-article","created":{"date-parts":[[2013,3,18]],"date-time":"2013-03-18T14:56:51Z","timestamp":1363618611000},"page":"910-917","source":"Crossref","is-referenced-by-count":27,"title":["Hospital\u2010based influenza surveillance in Korea: Hospital\u2010based influenza morbidity and mortality study group"],"prefix":"10.1002","volume":"85","author":[{"given":"Joon Young","family":"Song","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hee Jin","family":"Cheong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sung Hyuk","family":"Choi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji Hyeon","family":"Baek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seung Baik","family":"Han","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seong\u2010Heon","family":"Wie","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Byung Hak","family":"So","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyo Youl","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Young Keun","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Won Suk","family":"Choi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sung Woo","family":"Moon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacob","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gu Hyun","family":"Kang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hye Won","family":"Jeong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jung Soo","family":"Park","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Woo Joo","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,3,18]]},"reference":[{"key":"e_1_2_5_2_1","unstructured":"Centers for Disease Control and Prevention.2012.2011\u20132012 Flu Season Draws to a Close."},{"key":"e_1_2_5_3_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0036120"},{"key":"e_1_2_5_4_1","unstructured":"ChunBC ChoiWS KimJ JeongSY JangEJ LeeHJ KimWJ CheongHJ.2011.Estimation of mortality and morbidity attributable to influenza by influenza virus types and subtypes in Korea. 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