Bacterial Aerosol に関する研究 : 第5報室内における空中細菌, 落下菌, 床面付着菌の分析

概要

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Variations in the number of airborne, fallen and floor bacteria were examined in a model laboratory that was poorly ventilated with humans acting as bacterial carriers. The results obtained are summarized as follows:1. There were no correlation between the number of airborne or fallen bacteria and physicochemical conditions such as temperature, humidity, air velocity, CO2 or dust aerosols.2. The number of airborne and fallen bacteria increased when persons entered the room, and decreased after they went out. On the other hand, an increase in the number of floor bacteria was observed after the subjects in it had left. Moreover it became clear that the number of bacteria was related to the atmospheric volume per unit person in the room.3. It was found that nearly half the floor bacteria survived even after two weeks. This fact emphasizes the importance of the redispersal of floor bacteria by movement or walking when considering the origins of bacterial contamination of indoor air apart from those arising from the carriers.4. By comparison with experiments in an air-conditioned room, it is assumed that ventilation reduces the increment of the number of airborne bacteria in a room.