STUDY OF MICROORGANISMS WITHIN THE HOUSING ENVIRONMENT

Abstract

Abstract Bacteria are found virtually in every environment. High levels of bacteria concentration indoors is an indication of high occupancy rate, poor ventilation, low cleaning facilities and poor building maintenance. we study airborne Bacteria in Indoor Environments in two residences areas covering summer, winter season to study the climate effect (temperature) also covering high level and low level population to study the socioeconomic effect (good aeration, ventilation, cleaning facilities and variation of occupation area per citizens).we examine the presence of airb0rne Bacteria in Indoor Environments and colony forming unit for each case and we found that Exiguobacterium sp was the most frequent bacteria (37.5%) in high level population in the Summer climate, Bacillus sp was the most frequent bacteria (26.7%) in high level population in the Winter climate, Brachybacterium sp was the most frequent bacteria (42.4%) in low level population in the summer climate and kytococcus sp was the most frequent bacteria (32.2%) in low level population in the winter climate. Also we found a significant increase in colony forming unit in low level residence population in summer than in High level residence population in summer which indication the negative effect of high occupancy rate, poor ventilation and low cleaning facilities on quality of air and a significant increase in colony forming unit in High level residence population in summer than in High level residence population in winter which indicate high level of airborne bacteria due to high temperature.