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Updated: Jul 25, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
A comparison of passive and active dust sampling methods for measuring airborne methicillin-resistant Staphylococcus
Anne E Rittscher1, Abel A Vlasblom2, Birgitta Duim2
1Institute for Risk Assessment Sciences (IRAS), Faculty of Veterinary Medicine, Utrecht University, Yalelaan 2, 3584 CM Utrecht, The Netherlands.
Abstract:
Methicillin-resistant strains of Staphylococcus aureus (MRSA) are resistant to most β-lactam antibiotics. Pigs are an important reservoir of livestock-associated MRSA (LA-MRSA), which is genetically distinct from both hospital and community-acquired MRSA. Occupational exposure to pigs on farms can lead to LA-MRSA carriage by workers. There is a growing body of research on MRSA found in the farm environment, the airborne route of transmission, and its implication on human health. This study aims to directly compare two sampling methods used to measure airborne MRSA in the farm environment; passive dust sampling with electrostatic dust fall collectors (EDCs), and active inhalable dust sampling using stationary air pumps with Gesamtstaubprobenahme (GSP) sampling heads containing Teflon filters. Paired dust samples using EDCs and GSP samplers, totaling 87 samples, were taken from 7 Dutch pig farms, in multiple compartments housing pigs of varying ages. Total nucleic acids of both types of dust samples were extracted and targets indicating MRSA (femA, nuc, mecA) and total bacterial count (16S rRNA) were quantified using quantitative real-time PCRs. MRSA could be measured from all GSP samples and in 94% of the EDCs, additionally MRSA was present on every farm sampled. There was a strong positive relationship between the paired MRSA levels found in EDCs and those measured on filters (Normalized by 16S rRNA; Pearson's correlation coefficient r = 0.94, Not Normalized; Pearson's correlation coefficient r = 0.84). This study suggests that EDCs can be used as an affordable and easily standardized method for quantifying airborne MRSA levels in the pig farm setting.
Insights
Electrostatic dust fall collectors (EDCs) offer an affordable and effective method for measuring airborne Methicillin-resistant Staphylococcus aureus (MRSA) in pig farm environments. This passive sampling technique shows a strong correlation with active sampling, aiding in the monitoring of livestock-associated MRSA (LA-MRSA).
Area of Science:
- Environmental Microbiology
- Veterinary Public Health
- Infectious Diseases
Background:
- Livestock-associated Methicillin-resistant Staphylococcus aureus (LA-MRSA) in pigs poses occupational health risks to farm workers.
- Understanding airborne transmission routes of LA-MRSA in agricultural settings is crucial for risk assessment.
- Current methods for monitoring airborne pathogens in farm environments require evaluation for efficiency and cost-effectiveness.
Purpose of the Study:
- To directly compare the efficacy of two distinct sampling methods for quantifying airborne MRSA in pig farm environments.
- To assess the suitability of electrostatic dust fall collectors (EDCs) as a cost-effective and standardized tool for MRSA monitoring.
- To evaluate the prevalence and distribution of airborne MRSA across multiple Dutch pig farms.
Main Methods:
- Paired dust samples were collected using passive electrostatic dust fall collectors (EDCs) and active inhalable dust samplers (GSP) from 87 locations across 7 Dutch pig farms.
- Quantitative real-time PCR (qPCR) was employed to detect and quantify MRSA-specific genes (femA, nuc, mecA) and total bacterial 16S rRNA in collected dust samples.
- Statistical analysis, including Pearson's correlation, was used to compare MRSA levels obtained from the two sampling methods.
Main Results:
- Methicillin-resistant Staphylococcus aureus (MRSA) was detected in all active GSP samples and 94% of passive EDC samples, confirming its presence on all sampled farms.
- A strong positive correlation was observed between MRSA levels measured by EDCs and GSP samplers, both when normalized (r = 0.94) and not normalized (r = 0.84) by 16S rRNA.
- Electrostatic dust fall collectors (EDCs) demonstrated high sensitivity and reliability in detecting airborne MRSA in the intensive pig farming environment.
Conclusions:
- Electrostatic dust fall collectors (EDCs) represent a viable, affordable, and easily standardized method for quantifying airborne MRSA in pig farm settings.
- The findings support the use of EDCs for routine environmental monitoring of LA-MRSA, contributing to improved biosecurity and occupational health strategies.
- Further research could explore the application of EDCs in diverse livestock environments for broader MRSA surveillance.
