Journal of Korean Society of Occupational and Environmental Hygiene (한국산업보건학회지)

Korean Industrial Hygiene Association (한국산업보건학회)
권호 표지

Field Study of Characteristics of Airborne Bacteria Distributed in the Regulated Public Facilities

규제대상 다중이용시설내 부유세균의 분포 특성에 관한 현장 조사

  • Kim, Ki Youn (Department of Preventive Medicine & Public Health, Ajou University School of Medicine) ;
  • Jang, Gyu Yeob (Occupational and Environmental Medicine, Ajou University Medical Center) ;
  • Park, Jae Beom (Department of Preventive Medicine & Public Health, Ajou University School of Medicine) ;
  • Kim, Chi-Nyon (Institute for Occupational Health, College of Medicine, Yonsei University) ;
  • Lee, Kyung Jong (Department of Preventive Medicine & Public Health, Ajou University School of Medicine)
  • 김기연 (아주대학교 의과대학 예방의학교실) ;
  • 장규엽 (아주대학교병원 산업의학과) ;
  • 박재범 (아주대학교 의과대학 예방의학교실) ;
  • 김치년 (연세대학교 의과대학 산업보건연구소) ;
  • 이경종 (아주대학교 의과대학 예방의학교실)
  • Received : 2005.09.27
  • Accepted : 2005.12.31
  • Published : 2006.03.31
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Abstract

Concentration and identification of airborne bacteria in the regulated public facilities were examined with the six-stage cascade impactor. Geometric mean total and respirable concentrations of airborne bacteria were $404cfu/m^3$ and $194cfu/m^3$ in hospital, $931cfu/m^3$ and $358cfu/m^3$ in kindergarten, $294cfu/m^3$ and $134cfu/m^3$ in day-care center, and $586cfu/m^3$ and $254cfu/m^3$ in postpartum nurse center, respectively. As a result, culturable total and respirable concentrations of airborne bacteria were significantly highest in kindergarten and lowest in day-care center (p<0.05). The ratio of respirable to total concentration of airborne bacteria in the investigated public facilities was ranged from 30% to 40% but there was no significant difference among them (p>0.05). The mean I/O ratio of culturable total and respirable concentrations were 0.58 and 0.66 in hospital, 0.71 and 0.83 in kindergarten, 0.28 and 0.41 in day-care center, and 0.63 and 0.78 in postpartum nurse center, respectively. Day-care center showed the lowest I/O ratio of culturable total and respirable concentration of airborne bacteria (p<0.05) but a significant difference was not found among other facilities. Indoor concentration of airborne bacteria did not correlated significantly with indoor temperature and relative humidity (p>0.05) but had a significant positive correlation with $CO_2$ and surrounding condition (p<0.05). Staphylococcus spp., Micrococcus spp., Corynebacterium spp., and Bacillus spp. were dominant genera and amounted to over 95% of total airborne bacteria identified in the investigated public facilities. Size distributions of four dominant genera did not observed inconsistently regardless of type of public facility.

Keywords

References

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