Sampling and Characterization of Bioaerosols in Poultry Houses

Area of Science:

• Environmental microbiology
• Animal science
• Public health

Background:

• Confined Animal Feeding Units (CAFUs) present unique environments for microbial proliferation.
• Understanding microbial populations in CAFUs is crucial for animal and human health.
• Bioaerosol sampling methods must be robust in challenging conditions like high dust and temperature.

Purpose of the Study:

• To characterize the microbial populations, including pathogens, in poultry CAFUs.
• To evaluate the performance of the Wetted Wall Cyclone (WWC) bioaerosol collector in a CAFU setting.
• To inform strategies for managing bacterial infections and improving biosecurity in CAFUs.

Main Methods:

• Bioaerosol sampling using a Wetted Wall Cyclone (WWC) in occupied and unoccupied poultry houses.
• Bacterial content analysis via microbial plating, real-time Polymerase Chain Reaction (PCR), and Fatty Acid Methyl Ester (FAME) analysis.
• Monitoring of ambient temperature and relative humidity within the CAFUs.

Main Results:

• Microorganism concentrations in the occupied poultry house ranged from 4,000 to 60,000 colony forming units (CFU)/m³.
• Wetted Wall Cyclone (WWC) samples yielded approximately ten-fold more bacterial DNA than filter samples.
• Significant concentrations of pathogens, including *Salmonella*, *Staphylococcus*, and *Campylobacter*, were detected.

Conclusions:

• The Wetted Wall Cyclone (WWC) is effective for bioaerosol sampling in challenging CAFU environments.
• Poultry CAFUs harbor dynamic and significant populations of potentially pathogenic bacteria.
• Improved understanding of microbial dynamics can enhance management of bacterial infections and biosecurity.