Background: Good indoor air quality is important for human health and comfort, because people spend a most of their time within buildings. Microbial pollution is a key element of indoor air pollution. Bacteria and fun...Background: Good indoor air quality is important for human health and comfort, because people spend a most of their time within buildings. Microbial pollution is a key element of indoor air pollution. Bacteria and fungi growing indoors when sufficient moisture is available usually cause indoor air pollution. Methods: This study was conducted to assess the microbial concentration and to identify the main bacteria and fungi in the indoor environment of Central Library of the University of Yaoundé I. A total of 76 samples were taken from indoor air, surfaces and mouldy books. Bioaerosol sampling and air concentration were made by passive air sampling technique using petri dishes containing different culture media and exposed for 30, 60 and 90 min in the morning and afternoon. Sampling of surfaces and mouldy books were made by rubbing using sterile swab. The identification of the isolated microorganisms was based on macroscopic, microscopic and biochemical characters. Results: The concentrations of bacteria and fungi in the indoor environment of Central Library of the University of Yaoundé I ranged between 747 and 2324 CFU/m for the air and 40 and 500 CFU/cm2 for surfaces. In the examined area, the predominant culturable species of microflora were members of the following bacteria genera;Bacillus spp, Staphylococcus spp, Micrococcus spp, Pseudomonas spp, Rhodococcus spp, Enterobacter spp, Klebsiella spp and Escherichia spp and fungi;Aspergillus spp, Penicillium spp, Curvularia spp, Mucor spp, Cladosporium spp, Candida spp Rhodotorula spp, Fusarium spp, Trichophyton spp, Acremonium spp, Aureobasidium spp, Rhizopus spp and Chrysonilia spp. Conclusion: High concentrations of bacteria and fungi were observed in the central library of the University of Yaoundé I. Precautions and safety measures should be taken to reduce microbial pollution at universities libraries by improving libraries ventilation and disinfection.展开更多
Access to drinking water in rural and semi-rural areas is a major concern for the populations because of the quality of the resources. This research work aims to analyze the bacteriological quality of the water consum...Access to drinking water in rural and semi-rural areas is a major concern for the populations because of the quality of the resources. This research work aims to analyze the bacteriological quality of the water consumed by households in the Commune of Sô-Ava in order to establish a relationship between this quality and the health problems observed within the communities. To succeed in this study, documentary research, surveys and observations in the field and analyzes of eighty-two (82) water samples were analyzed in the laboratory during two (2) seasons (rainy and dry). From the results obtained, it appears that the samples present concentrations of total germs, faecal coliforms, Escherichia coli, faecal enterococci, sulphite-reducing anaerobic bacteria (ASR), salmonella and Shiguela which do not comply with the water potability standards in respectively 78.05%, 60.98%, 50%, 64.63%, 80.49% and 70.73% of the samples taken. The statistics on the diseases recorded during this decade in the Commune showed that the populations of Sô-Ava are confronted with several ailments such as: malaria (75%), Acute Respiratory Infections IRA, (16%) and Gastrointestinal disorders (5%) especially during floods and during the rainy season. Education and sensitization of the population on good public hygiene practices around water must be highlighted in order to avoid waterborne diseases.展开更多
文摘Background: Good indoor air quality is important for human health and comfort, because people spend a most of their time within buildings. Microbial pollution is a key element of indoor air pollution. Bacteria and fungi growing indoors when sufficient moisture is available usually cause indoor air pollution. Methods: This study was conducted to assess the microbial concentration and to identify the main bacteria and fungi in the indoor environment of Central Library of the University of Yaoundé I. A total of 76 samples were taken from indoor air, surfaces and mouldy books. Bioaerosol sampling and air concentration were made by passive air sampling technique using petri dishes containing different culture media and exposed for 30, 60 and 90 min in the morning and afternoon. Sampling of surfaces and mouldy books were made by rubbing using sterile swab. The identification of the isolated microorganisms was based on macroscopic, microscopic and biochemical characters. Results: The concentrations of bacteria and fungi in the indoor environment of Central Library of the University of Yaoundé I ranged between 747 and 2324 CFU/m for the air and 40 and 500 CFU/cm2 for surfaces. In the examined area, the predominant culturable species of microflora were members of the following bacteria genera;Bacillus spp, Staphylococcus spp, Micrococcus spp, Pseudomonas spp, Rhodococcus spp, Enterobacter spp, Klebsiella spp and Escherichia spp and fungi;Aspergillus spp, Penicillium spp, Curvularia spp, Mucor spp, Cladosporium spp, Candida spp Rhodotorula spp, Fusarium spp, Trichophyton spp, Acremonium spp, Aureobasidium spp, Rhizopus spp and Chrysonilia spp. Conclusion: High concentrations of bacteria and fungi were observed in the central library of the University of Yaoundé I. Precautions and safety measures should be taken to reduce microbial pollution at universities libraries by improving libraries ventilation and disinfection.
文摘Access to drinking water in rural and semi-rural areas is a major concern for the populations because of the quality of the resources. This research work aims to analyze the bacteriological quality of the water consumed by households in the Commune of Sô-Ava in order to establish a relationship between this quality and the health problems observed within the communities. To succeed in this study, documentary research, surveys and observations in the field and analyzes of eighty-two (82) water samples were analyzed in the laboratory during two (2) seasons (rainy and dry). From the results obtained, it appears that the samples present concentrations of total germs, faecal coliforms, Escherichia coli, faecal enterococci, sulphite-reducing anaerobic bacteria (ASR), salmonella and Shiguela which do not comply with the water potability standards in respectively 78.05%, 60.98%, 50%, 64.63%, 80.49% and 70.73% of the samples taken. The statistics on the diseases recorded during this decade in the Commune showed that the populations of Sô-Ava are confronted with several ailments such as: malaria (75%), Acute Respiratory Infections IRA, (16%) and Gastrointestinal disorders (5%) especially during floods and during the rainy season. Education and sensitization of the population on good public hygiene practices around water must be highlighted in order to avoid waterborne diseases.
