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Abstract

Studies on building design and microbial load in buildings in Port Harcourt metropolis was done in wet and dry seasons and during the day and at night periods. Different microbiological media were used to determine the level of microbial populations and physiological types in the sampling sites. Microbial counts ranged from 1.16x102-4.0x102 CFU 30 min-1 exposure to air wet season and 8.6x102 to 2.93x103 CFU 30 min-1 exposure to air dry season. Microbial populations were more in dry season than in wet season. Mean microbial counts were 1.05x103 CFU 30 min-1 and 9.7x102 CFU 30 min-1 exposure to air during the day and night periods, respectively. Microbial counts were higher during the day than at night. Seven organisms isolated in all the sites include Bacillus sp., Enterobacter sp. and Staphylococcus sp. bacteria and Cladosporium sp., Mucor sp., Penicilium sp. and Rhizopus sp. fungi. Some genera occurred in all sites and were more prevalent while others did not occur in all the sites and were less prevalent. Generally, more bacterial genera were isolated during the dry season than during the wet season, whereas the reverse was the case for fungi.