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Korean J Clin Microbiol. 2010 Sep;13(3):103-108. English. Original Article. https://doi.org/10.5145/KJCM.2010.13.3.103
Yoo SJ , Noh CH , Yoo HM , Shin WC , Choi SJ , Kim BN , Kim CK , Chey MJ , Kim K , Lee SL , Kuak EY , Shin BM .
Department of Laboratory Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea. bmshin@unitel.co.kr
Department of Infection Control Office, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Department of Urology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Department of Internal Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Department of Pediatrics, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Department of Family Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Department of Emergency Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
Abstract

BACKGROUND: The aim of this study is to clarify the epidemiology of swine-origin influenza A (H1N1) virus 2009 (S-OIV) during the first month of outbreak at one of influenza clinic in Seoul, Korea. METHODS: We documented the epidemiologic and clinical features of S-OIV-confirmed cases who visited a university hospital in Northeastern Seoul between August 21 and September 20, 2009. Nasopharyngeal swab of patients with acute febrile respiratory illnesses were evaluated with rapid influenza antigen tests and multiplex RT-PCR for S-OIV and seasonal influenza A. RESULTS: A total of 5,322 patients with acute febrile respiratory illnesses were identified at our influenza clinic for the study period. S-OIV was confirmed in 309 patients by RT-PCR. The patients ranged from 2 months to 61 years of age and 189 patients (61.2%) were teenagers. Eighty-one patients had known contact with S-OIV-confirmed patients in schools (N=61), households (N=15), and healthcare facilities (N=3). Frequent symptoms were fever (94.5%), cough (73.1%), sore throat (52.1%), and rhinorrhea (50.5%). Gastrointestinal symptoms were also present in 10 patients (4.9%). Ten patients (4.9%) required hospitalizations. Seventy patients (22.7%) could not take oseltamivir at the first visits, however, all of them recovered without complication. Rapid antigen tests showed the sensitivity of 44.4% (130/294). Patients with positive antigen tests, compared with negative antigen tests, showed higher frequencies of rhinorrhea (60.8% vs 43.3%, P=0.004) and stuffy nose (33.8% vs 20.1%, P=0.012). CONCLUSION: S-OIV infections spread predominately in school-aged children during the early accelerating phase of the outbreak. Rapid influenza antigen tests were correlated with nasal discharge and obstruction.

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