Livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) is highly prevalent in pigs and veal calves. The environment and air in pig and veal calf barns is often contaminated with LA-MRSA, and can act as a transmission source for humans. This study explores exposure–response relationships between sequence type 398 (ST398) MRSA air exposure level and nasal ST398 MRSA carriage in people working and/or living on farms. Samples and data were used from three longitudinal field studies in pig and veal calf farm populations. Samples consisted of nasal swabs from the human participants and electrostatic dust fall collectors capturing airborne settled dust in barns. In both multivariate and mutually adjusted analyses, a strong association was found between nasal ST398 MRSA carriage in people working in the barns for >20 h per week and MRSA air levels. In people working in the barns < 20 h per week there was a strong association between nasal carriage and number of working hours. Exposure to ST398 MRSA in barn air seems to be an important determinant for nasal carriage, especially in the highly exposed group of farmers, next to duration of contact with animals. Intervention measures should therefore probably also target reduction of ST398 MRSA air levels.

Transmission through air as a possible route of exposure for MRSA

D.4. Empirical Modelling of Deposition Data D.4. I. Aerodynamic deposition D.4.1. I. Slip correction factor D.4. I .2. Aerodynamic shape factor D.4. I .3. Aerodynamic deposition efficiency D.J.2. Thermodynamic deposition D.4.2. I. Relating thermodynamic to aerodynamic diamctcr D.4.2.2. Correction of thermodynamic diamctcr for cxtrcmely SIllilll particles D.4.2.3. Diffusional deposition cfficicncy D.4.3. Combining thermodynamic and aerodynamic deposition

https://journals.sagepub.com/doi/pdf/10.1016/0146-6453%2894%2990042-6

Annexe D. deposition of inhaled particles

Both area and personal air samples collected during an asbestos abatement project were matched and statistically analysed. Among the many parameters studied were fibre concentrations and their variabi

A Statistical Evaluation of Asbestos Air Concentrations

Although bioaerosols from both cage-housed (CH) and floor-housed (FH) poultry operations are highly concentrated, the concentrations of dust, endotoxin, and bacteria are significantly higher in FH bioaerosols. Workers from CH operations have reported a greater prevalence of respiratory symptoms. To date, archaea have been examined in swine and dairy bioaerosols but not in poultry bioaerosols. The objective of this study was to directly compare methanogenic archaea concentrations in bioaerosols from CH and FH poultry facilities. Bioaerosols were collected from 15 CH and 15 FH poultry operations, using stationary area samplers as well as personal sampling devices. Archaea were quantified and their diversity was investigated using polymerase chain reaction (PCR) followed by denaturing gradient gel electrophoresis (DGGE) and band sequencing. Archaea were significantly higher in area and personal bioaerosols of CH poultry operations than in those from FH poultry operations (p < 0.001 and p < 0.05, respectively...

Archaeal characterization of bioaerosols from cage-housed and floor-housed poultry operations.

Introduction: Chlorination is a method commonly used to keep indoor swimming pool water free from pathogens. However, chlorination of swimming pools produces several potentially hazardous by-produc ...

/pdf/occupational-exposure-to-trichloramine-and-trihalomethanes-1pida6xn6y.pdf

Occupational Exposure to Trichloramine and Trihalomethanes in Swedish Indoor Swimming Pools: Evaluation of Personal and Stationary Monitoring.

The particle size and mean concentration of radioactive aerosols measured by personal and static air samples.

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The particle size and mean concentration of radioactive aerosols measured by personal and static air samples.