Hospital-based influenza surveillance in Korea

Hospital-based influenza morbidity and mortality study group

Joon-Young Song, Hee-Jin Cheong, Sung Hyuk Choi, Ji Hyeon Baek, Seung Baik Han, Seong Heon Wie, Byung Hak So, Hyo Youl Kim, Young Keun Kim, Wonseok Choi, Sungwoo Moon, Jacob Lee, Gu Hyun Kang, Hye Won Jeong, Jung Soo Park, Woo Joo Kim

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Influenza epidemics occur annually with variations in size and severity. Hospital-based Influenza Morbidity & Mortality was established to monitor influenza epidemics and their severity, which is composed of two surveillance systems: emergency room-based and inpatient-based surveillance. Regarding emergency room-based surveillance, influenza-like illness index (influenza-like illness cases per 1,000 emergency room-visiting subjects), number of laboratory-confirmed cases and the distribution of influenza types were estimated weekly. Inpatient-based surveillance included monitoring for hospitalization, complications, and mortality. The emergency room influenza-like illness index correlated well with the number of laboratory-confirmed influenza cases, and showed a bimodal peak at Week 4 (179.2/1,000 emergency room visits) and Weeks 13-14 (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 2011-2012 season, the mean admission rate of emergency room-visiting patients with influenza-like 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-based Influenza Morbidity & Mortality was effective for monitoring the trends in circulating influenza activity concurrently with its severity. In the 2011-2012 season, the influenza epidemic persisted for a ≥5-month period, with a bimodal peak of influenza A and B in sequence. Overall, influenza A was more severe than influenza B. J. Med. Virol. 85:910-917, 2013.

Original languageEnglish
Pages (from-to)910-917
Number of pages8
JournalJournal of Medical Virology
Volume85
Issue number5
DOIs
Publication statusPublished - 2013 May 1

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Korea
Human Influenza
Morbidity
Mortality
Hospital Emergency Service
Inpatients

Keywords

  • Influenza
  • Influenza-like illness
  • Surveillance

ASJC Scopus subject areas

  • Virology
  • Infectious Diseases

Cite this

Hospital-based influenza surveillance in Korea : Hospital-based influenza morbidity and mortality study group. / Song, Joon-Young; Cheong, Hee-Jin; Choi, Sung Hyuk; Baek, Ji Hyeon; Han, Seung Baik; Wie, Seong Heon; So, Byung Hak; Kim, Hyo Youl; Kim, Young Keun; Choi, Wonseok; Moon, Sungwoo; Lee, Jacob; Kang, Gu Hyun; Jeong, Hye Won; Park, Jung Soo; Kim, Woo Joo.

In: Journal of Medical Virology, Vol. 85, No. 5, 01.05.2013, p. 910-917.

Research output: Contribution to journalArticle

Song, Joon-Young ; Cheong, Hee-Jin ; Choi, Sung Hyuk ; Baek, Ji Hyeon ; Han, Seung Baik ; Wie, Seong Heon ; So, Byung Hak ; Kim, Hyo Youl ; Kim, Young Keun ; Choi, Wonseok ; Moon, Sungwoo ; Lee, Jacob ; Kang, Gu Hyun ; Jeong, Hye Won ; Park, Jung Soo ; Kim, Woo Joo. / Hospital-based influenza surveillance in Korea : Hospital-based influenza morbidity and mortality study group. In: Journal of Medical Virology. 2013 ; Vol. 85, No. 5. pp. 910-917.
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AU - Han, Seung Baik

AU - Wie, Seong Heon

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AU - Choi, Wonseok

AU - Moon, Sungwoo

AU - Lee, Jacob

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