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The Efficiency of Biofilters at Mitigating Airborne MRSA from a Swine Nursery
Abstract:
Our prior studies have been in agreement with other researchers in detecting airborne methicillin-resistant Staphylococcus aureus (MRSA) inside and downwind of a swine housing facility. MRSA emitted in the exhaust air of swine facilities creates a potential risk of transmission of these organisms to people in the general area of these facilities as well as to other animals. This study investigated a possible means of reducing those risks. We investigated the efficiency of biofilters to remove MRSA from the exhaust air of a swine building. Two types of biofilter media (hardwood chips and western red cedar shredded bark) were evaluated. Efficiency was measured by assessing both viable MRSA (viable cascade impactor) and dust particles (optical particle courter) in the pre-filtered and post-filtered air of a functioning swine production facility. Our study revealed that hardwood chips were respectively 92% and 88% efficient in removing viable MRSA and total dust particles. Western red cedar was 95% efficient in removing viable MRSA and 86% efficient in removing dust particles. Our findings suggest that biofilters can be used as effective engineering controls to mitigate the transmission of aerosolized MRSA in the exhaust air of enclosed swine housing facilities.
Insights
Biofilters effectively remove airborne methicillin-resistant Staphylococcus aureus (MRSA) and dust from swine facility exhaust. This technology offers a promising solution for reducing MRSA transmission risks to people and animals.
Area of Science:
- Environmental Science
- Microbiology
- Agricultural Engineering
Background:
- Airborne methicillin-resistant Staphylococcus aureus (MRSA) has been detected in swine facilities.
- MRSA emission poses a transmission risk to humans and animals.
- Effective control measures are needed to mitigate this risk.
Purpose of the Study:
- To evaluate the efficiency of biofilters in removing airborne MRSA from swine facility exhaust.
- To compare the efficacy of hardwood chips and western red cedar bark as biofilter media.
- To assess the impact of biofiltration on dust particle removal.
Main Methods:
- Two types of biofilters (hardwood chips, western red cedar bark) were tested.
- MRSA removal efficiency was measured using a viable cascade impactor.
- Dust particle removal was assessed using an optical particle counter.
- Air samples were collected from a functioning swine production facility.
Main Results:
- Hardwood chips achieved 92% MRSA and 88% dust removal.
- Western red cedar achieved 95% MRSA and 86% dust removal.
- Both biofilter media demonstrated high efficiency in removing viable MRSA and dust particles.
Conclusions:
- Biofilters are effective engineering controls for reducing airborne MRSA in swine housing.
- Hardwood chips and western red cedar are suitable media for MRSA biofiltration.
- Biofiltration can mitigate the transmission of aerosolized MRSA from agricultural environments.
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