Topic
Bioaerosol
About: Bioaerosol is a research topic. Over the lifetime, 1347 publications have been published within this topic receiving 34791 citations.
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TL;DR: This study found no significant difference in bioaerosol load for a forward facing versus reverse facing individual, and for the average hot shower the total number of respirableBioaerosols is higher, but the observed culturability of those aerosolized cells is lower when compared to lower temperatures.
11 citations
TL;DR: The dynamics of bioaerosol generation in specific occupational environments where mail is manually unpacked and sorted was investigated.
Abstract: H. BRANDL, R. BACHOFEN AND M. BISCHOFF. 2005. Aims: The dynamics of bioaerosol generation in specific occupational environments where mail is manually unpacked and sorted was investigated. Methods and Results: Total number of airborne particles was determined in four different size classes (0AE3‐0AE5, 0AE5‐1, 1‐5 and >5 lm) by laser particle counting. Time dependent formation of bioaerosols was monitored by culturing methods and by specific staining followed by flow cytometry. Besides handling of regular mail, specially prepared letters (� spiked letters� ) were added to the mailbags to deliberately release powdered materials from letters and to simulate high impact loads. These letters contained various dry powdered biological and nonbiological materials such as milk powder, mushrooms, herbs and cat litter. Regarding the four size classes, particulate aerosol composition before mail handling was determined as 83AE 2±1 AE0, 15AE 2±0 AE7, 1AE 7±0 AE4 and 0AE04 ± 0AE02%, respectively, whereas the composition changed during sorting to 66AE 8±7 AE9, 22AE 3±3 AE6, 10AE 4±4 AE0 and 0AE57 ± 0AE27%, respectively. Mail processing resulted in an increase in culturable airborne bacteria and fungi. Maximum concentrations of bacteria reached 450 CFU m )3 , whereas 270 CFU of fungi were detected. Conclusions: Indoor particle concentrations steadily increased during mail handling mostly associated with particles of diameters >1 lm. However, it was not possible to distinguish spiked letters from nonspiked by simple particle counting and CFU determinations. Significance and Impact of Study: The dynamics of bioaerosol generation have to be addressed when monitoring specific occupational environments (such as mail sorting facilities) regarding the occurrence of biological particles.
11 citations
TL;DR: In this article, the effects of seasonal variations, environmental factors such as air pollution, and meteorological factors on microbial diversity are poorly understood, and the results of this study can be used as a reference by other bioaerosol research that focuses on the health effects of atmospheric particulate matter.
Abstract: In China, air pollution has become a significant environmental threat to human health in recent years. Airborne bacteria are critical constituents of microbial aerosols, which contain numerous pathogens. However, the effects of seasonal variations, environmental factors such as air pollution, and meteorological factors on microbial diversity are poorly understood. In this study, fine particulate matter (PM2.5) samples (n = 12) were collected using a high-volume air sampler over 24-hour periods during all four seasons from April 2017 to January 2018. Concurrently, the average daily concentrations of various air pollutants and the meteorological conditions were monitored. High-throughput sequencing of 16s rRNA was then employed to profile PM2.5 bacterial communities. The results showed that the bacterial communities varied significantly by season. Proteobacteria (35.5%), Firmicutes (23.0%), and Actinobacteria (16.2%) were the most abundant bacterial phyla in the PM2.5 samples. At the genus level, the diversity of the bacterial communities was significantly correlated with the ozone (O3) concentration (r = 0.920, p = 0.001) and air temperature (T) (r = 0.534, p = 0.023). The results of this study can be used as a reference by other bioaerosol research that focuses on the health effects of atmospheric particulate matter.
11 citations
TL;DR: In this paper , the authors discuss different types of passive bioaerosol samplers, including their collection mechanisms, advantages and disadvantages, applicability in different sampling environments, and available sample elution and analysis methods.
11 citations
TL;DR: In this article, the airborne microorganisms (bacteria and fungi) at a swine wastewater treatment plant were quantified at three different phases of the treatment process over a 1-yr period.
Abstract: Quantification of the airborne microorganisms (bacteria and fungi) at a swine wastewater treatment plant was performed. Microbial samples were collected at three different phases of the treatment process over a 1-yr period. Cultivation methods based on the viable counts of mesophilic heterotrophic bacteria and fungi were performed. The concentrations of airborne bacteria ranged up to about 5 × 103 colony-forming unit (CFU)/m3, and those of airborne fungi ranged up to about 9 × 102 CFU/m3. The primary treatment (e.g., screen, grit removal, and primary sedimentation) was found to be the major source of airborne microorganisms at the site studied, and higher levels of airborne bacteria and fungi were observed in summer. High levels of the respirable bioaerosol (0.65 to 4.7 μm in size) were detected in the aeration phase. Among the environmental factors studied, temperature was strongly associated with fungal aerosol generation (with a Spearman correlation coefficient of 0.90 and p-value <0.01). Occupational biorisks are discussed based on the observed field data.
11 citations