公立小学室内细菌负荷及其与室内物理空气质量参数的相关性。
Indoor bacterial load and its correlation to physical indoor air quality parameters in public primary schools.
作者信息
Andualem Zewudu, Gizaw Zemichael, Bogale Laekemariam, Dagne Henok
机构信息
Department of Environmental and Occupational Health and Safety, Institute of Public Health, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia.
出版信息
Multidiscip Respir Med. 2019 Jan 22;14:2. doi: 10.1186/s40248-018-0167-y. eCollection 2019.
BACKGROUND
Poor indoor air quality is a great problem in schools due to a high number of students per classroom, insufficient outside air supply, poor construction and maintenance of school buildings. Bacteria in the indoor air environment pose a serious health problem. Determination of bacterial load in the indoor environment is necessary to estimate the health hazard and to create standards for indoor air quality control. This is especially important in such densely populated facilities like schools.
METHODS
Institutional based cross-sectional study was conducted among 51 randomly selected classrooms of eight public primary schools from March 29-April 26, 2018. To determine the bacterial load passive air sampling settle plate method was used by exposing a Petri dish of blood agar media for an hour. The Pearson correlation matrix was employed to assess the correlation between bacterial load and physical parameters.
RESULTS
The grand total mean bacterial load was 2826.35 CFU/m in the morning and 4514.63 CFU/m in the afternoon. The lowest and highest mean bacterial load was recorded at school 3 (450.67 CFU/m) and school 5 (7740.57 CFU/m) in the morning and afternoon, respectively. In the morning relative humidity ( = - 0.7034), PM2.5 ( = 0.5723) and PM10 ( = 0.6856); in the afternoon temperature ( = 0.3838), relative humidity ( = - 0.4014) were correlated with indoor bacterial load. and were among isolated bacteria.
CONCLUSIONS
High bacterial load was found in public primary schools in the Gondar city as compared to different indoor air biological standards. Temperature, relative humidity and particulate matter concentration (PM2.5 and PM10) were associated with the indoor bacterial load. and were among isolated bacterial species. Attention should be given to control those physical factors which favour the growth and multiplication of bacteria in the indoor environment of classrooms to safeguard the health of students and teachers in school.
背景
由于每间教室学生人数众多、室外空气供应不足、学校建筑施工和维护不善，室内空气质量差是学校面临的一个重大问题。室内空气环境中的细菌构成严重的健康问题。确定室内环境中的细菌负荷对于评估健康危害和制定室内空气质量控制标准是必要的。这在像学校这样人口密集的场所尤为重要。
方法
2018年3月29日至4月26日，在八所公立小学随机抽取的51间教室中进行了基于机构的横断面研究。为了确定细菌负荷，采用被动空气采样沉降平板法，将血琼脂培养基培养皿暴露一小时。采用Pearson相关矩阵评估细菌负荷与物理参数之间的相关性。
结果
上午细菌总平均负荷为2826.35CFU/m，下午为4514.63CFU/m。上午和下午，细菌平均负荷最低值和最高值分别出现在学校3（450.67CFU/m）和学校5（7740.57CFU/m）。上午，相对湿度（=-0.7034）、PM2.5（=0.5723）和PM10（=0.6856）；下午，温度（=0.3838）、相对湿度（=-0.4014）与室内细菌负荷相关。和是分离出的细菌种类。
结论
与不同的室内空气生物学标准相比，发现贡德尔市公立小学的细菌负荷较高。温度、相对湿度和颗粒物浓度（PM2.5和PM10）与室内细菌负荷有关。和是分离出的细菌种类。应注意控制那些有利于教室室内环境中细菌生长和繁殖的物理因素，以保障学校师生的健康。
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