Distribution of airborne bacteria in the entire regions of South Korea was investigated and analyzed by region and type of multi-use facilities. At first, 10 public facilities were selected including general restaurant, retail store, public transport, retail market, apartment house, underground parking lot, financial institution, business facility, educational institution, and public toilet, which are located at the regions such as Seoul, Busan, Daejeon, Gwangju, Gyeonggi, Jeju, and Gangwon. The regional distribution of the floating bacteria was identified that Micrococcus sp. was highly prevalent in Seoul (21.5 percent). In Daejeon, Bacillus sp. was highly prevalent (12.4 percent). In Busan, Micrococcus sp. was highly prevalent (22.8 percent). In Gwangju, Bacillus sp. was 9.35%. In Gyeonggi, Micrococcus sp. was 13.7%, and in Gwangju and Jeju, Micrococcus sp. was 11.2 percent and 92%. All in all, Micrococcus sp. and Bacillus sp. were highly detected throughout the entire region and multi-use facilities. Next, whether or not these airborne bacteria could influence the health of people was examined using HaCat human skin cell line which is human epithermal Karatinocytes related to allergic dermatitis. Among these isolated microorganisms, the HaCat cell proliferation was decreased by Arthrobacter sp., Bacillus sp., Brachybacterium sp., Brevundimonas sp., Kocuria sp., Mammaliicoccus sp., Norcardia sp., Prestia sp., Phychrobacillus sp., and Rhodococcus sp., while it was affected by the other bacteria. Therefore, these results have suggested that the airborne floating bacteria could be considered as the marker for the environmental risk management against atopic dermatitis, and it is needed for controlling the bacteria number that suppressed the proliferation of HaCat cells.

Abstract
1. 서 론
2. 연구방법
    2.1 실내 공기중 부유세균의 포집
    2.2 실내공기 부유세균 유전자 염기서열을 이용한 군집분석
    2.3 피부표피세포주의 배양
    2.4 MTT assay
    2.5 통계분석
3. 결과 및 고찰
4. 결 론
감사의 글
References

• 박용성(고려대학교 알레르기면역연구소) | Yongsung Park (Allergy Immunology Center, College of Medicine, Korea University)
• 권순현(고려대학교 알레르기면역연구소) | Soonhyun Kwon (Allergy Immunology Center, College of Medicine, Korea University)
• 이준환(고려대학교 알레르기면역연구소) | Joonhwan Lee (Allergy Immunology Center, College of Medicine, Korea University)
• 이효선(고려대학교 알레르기면역연구소) | HyoSeon Lee (Allergy Immunology Center, College of Medicine, Korea University)
• 박송이(고려대학교 의과대학 미생물학교실) | Song-Yi Park (Department of Microbiology, College of Medicine, Korea University)
• 기선호(고려대학교 의과대학 미생물학교실) | Sun-Ho Kee (Department of Microbiology, College of Medicine, Korea University)
• 윤원석(고려대학교 알레르기면역연구소,고려대학교 의과대학 실내공기생물학적유해인 자 건강영향평가 사업단) | Wonsuck Yoon (Allergy Immunology Center, College of Medicine, Korea University, Air microbiome Health Research Institute, College of Medicine, Korea University.) Corresponding author