Korean journal of food and cookery science (한국식품조리과학회지)

Korean Society of Food and Cookery Science (한국식품조리과학회)
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Prevalence of Microbiological Contamination on Water Purifiers at Lunchroom in Child Care Center

어린이집 급식실 정수기의 미생물학적 오염 평가

  • Yoon, Mi-Hye (Health Research Department, Gyeonggi-do Institute of Health & Environment) ;
  • Kim, Jung-Beom (Health Research Department, Gyeonggi-do Institute of Health & Environment) ;
  • Oh, Hyuk-Soo (Department of Hotel Culinary Arts, Shinansan University)
  • 윤미혜 (경기도보건환경연구원 보건연구부) ;
  • 김중범 (경기도보건환경연구원 보건연구부) ;
  • 오혁수 (신안산대학교 호텔조리과)
  • Published : 2012.10.31
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Abstract

In this study, the prevalence of microbiological hazard on water purifiers at lunchroom in child care center was investigated. A total of 49 water purifiers and their purified cold water were sampled to test about the total aerobic bacteria, coliform bacteria, Bacillus cereus, Staphylococcus aureus, and Salmonella spp. Total aerobic bacteria was detected over 2.0 log CFU/mL in 6 out of 49 purified cold water (12.2%), ranged from 2.0 to 2.4 log CFU/mL, and the average number of total aerobic bacteria was showed to be 3.3 log CFU/drain spout. The drain spout turned out to be a major contaminant in water purifier and needs to be improved. Coliform bacteria were also detected in 7 out of 49 cold faucets (14.3%) and 7 out of 49 drain spouts (14.3%), but not detected in purified cold water. All samples were not contaminated with the pathogens tested in this study, except for B. cereus, which was contaminated on 2 out of 49 cold faucets (4.1%) and 4 out of 49 drain spouts (8.2%). All of B. cereus isolates produced enterotoxin, such as heamolysin BL enterotoxin (HBL) or non-heamolytic enterotoxin (NHE). The HBL was detected in 5 out of 6 B. cereus isolates (83.3%), including B. cereus PCF-11 and B. cereus PDS-30 isolate only produced NHE (16.7%). These results showed that the sanitary conditions of cold faucets and drain spouts should be improved promptly.

Keywords

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