Microbiological characterization of stable resuspended dust

Area of Science:

• Environmental Science
• Microbiology
• Animal Health

Background:

• Equine recurrent airway obstruction (RAO) is linked to poor stable air quality, including dust and aeroallergens.
• Aeroallergens like endotoxins may cause inflammation in human airways and exceed safe levels in stables.
• Respirable dust particles can carry hazardous biological agents, posing risks to horses and humans.

Purpose of the Study:

• To characterize the microbial community of respirable dust in a Hungarian stable.
• To determine if dust particles convey hazardous pathogenic bacteria.
• To assess the risk to horses and stable staff.

Main Methods:

• Resuspended dust (PM1-10 fraction) was collected using a PARTISOL-FRM sampler.
• Microbial taxa were identified using culture-independent next-generation sequencing (NGS) of 16S rRNA gene regions.
• Analysis focused on identifying potentially pathogenic bacteria within the dust.

Main Results:

• A total of 1491 taxa were identified, with 384 at the species level.
• The microbial community was dominated by ubiquitous soil and organic material-dwelling taxa.
• Pathogenic bacteria were found at low abundance.

Conclusions:

• The respirable dust in the studied stable was not dominated by hazardous pathogens.
• Facultative human pathogens, primarily Staphylococcus species, were the most prevalent.
• The risk posed by pathogenic bacteria in this stable environment appears to be low.