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J Prev Med Public Health > Volume 42(6); 2009 > Article
Journal of Preventive Medicine and Public Health 2009;42(6): 408-415. doi: https://doi.org/10.3961/jpmph.2009.42.6.408
Mumps Transmission Control Status and Inapparent Infection Rate among Middle and High School Students during the 2007-2008 Mumps Outbreak in Daegu.
Kyo Hyun Kim, Chang Hwi Kim, Bo Youl Choi, Un Yeong Go, Dong Han Lee, Moran Ki
1Department of Preventive Medicine, Eulji University School of Medicine, Daejeon, Korea. kimoran@eulji.ac.kr
2Department of Pediatrics, Soonchunhyang University, College of Medicine, Bucheon, Korea.
3Department of Preventive Medicine, Hanyang University, College of Medicine, Seoul, Korea.
4Korea Center for Disease Control and Prevention, Seoul, Korea.
OBJECTIVES: This study was performed to investigate the mumps transmission control status and inapparent infection rate among middle and high school students in Daegu City during a mumps outbreak. METHODS: Nine schools (two middle schools and seven high schools), which reported a number of mumps cases between 2007 and 2008 were selected for investigation. During March-May 2008, a standard questionnaire was distributed to gather information about case identification, instructed isolation measure, isolation status of mumps cases and related factors, and outdoor activities of non-isolated mumps case. Inapparent infection rate was estimated by serum mumps IgM and IgG antibodies status and self-reported mumps symptoms in three of the nine schools. RESULTS: Among 2,560 respondents, more than half of students answered that they did not receive instructions in mumps transmission control measures during the outbreak. Among the 327 mumps cases identified by the questionnaire, 131 cases (40.1%) were considered as isolated and the isolation rates were significantly different among schools, grades, and gender. Of the non-isolated cases, 88.3% continued attending school. Inapparent mumps infection rates were between 56.3% and 70.2%. CONCLUSIONS: Mumps transmission control was inadequate to control the mumps outbreak. Although high inapparent infection rate would mitigate the transmission control effect of case isolation, this measure is fundamental for infection control. The reasons of this inadequate status need to be explored to develop an effective intervention strategy.
Key words: Mumps; Disease outbreaks; Infection control; Patient isolation
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