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Updated: Jun 28, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Molecular Evaluation of Traditional Chicken Farm-Associated Bioaerosols for Methicillin-Resistant Staphylococcus
Chi-Wei Tao1,2, Jung-Sheng Chen3, Bing-Mu Hsu4
1Department of Internal Medicine, Cheng Hsin General Hospital, Taipei 112401, Taiwan.
Abstract:
The outbreak of airborne pathogens, such as methicillin-resistant Staphylococcus aureus (MRSA) through bioaerosol, and their molecular characterization around domestic poultry farming areas, was not completely understood. This imposes risk of a MRSA-associated health threat for the relevant livestock food production units. To address this issue, the present study investigated the role of bioaerosol in transmitting MRSA strains in poultry house settings by combining molecular typing, phylogenetic classification, antibiotic susceptibility, and virulence gene distribution patterns. The present study highlights that all 18 bioaerosol and stool samples collected were MRSA positive, with a unique set of virulence factors. Out of 57 isolated MRSA isolates, 68.4% and 19.3% consisted of SCCmec I and IV elements, respectively, which are commonly linked with hospital-acquired and livestock-associated MRSA strains. It is worth noting that the exfoliative toxin eta and etb genes were carried by 100% and 70.2% of all isolates, respectively. Only 17.5% of strains showed the presence of enterotoxin entC. These MRSA isolates were resistant to chloramphenicol (C), ciprofloxacin (CIP), clindamycin (DA), erythromycin (E), and tetracycline (T), signifying their multi-drug resistance traits. A cluster of phylogenetic analysis described that 80.7% and 15.8% of total isolates belonged to Staphylococcus aureus protein A (spa) type t002 and t548. Whereas 3.5% were reflected as a new spa type. Additionally, as per the chi-squared test score value, these two spa types (t002 and t548) have a distribution correlation with HA-MRSA and LA-MRSA in all the samples (p < 0.005, chi-squared test; degree of freedom = 1). Ultimately, this study highlights the prevalence of MRSA colonization in the conventional poultry farm environment, showing the risk of bioaerosol transmission, which needs epidemiological attention and prevention strategies.
Insights
Airborne methicillin-resistant Staphylococcus aureus (MRSA) is prevalent in poultry farms, posing a health risk. Bioaerosols transmit these multi-drug resistant strains, necessitating urgent prevention strategies.
Area of Science:
- Environmental microbiology
- Veterinary public health
- Molecular epidemiology
Background:
- The transmission of methicillin-resistant Staphylococcus aureus (MRSA) via bioaerosols in domestic poultry farming is poorly understood.
- MRSA poses a significant health risk to livestock food production units and potentially public health.
Purpose of the Study:
- To investigate the role of bioaerosol in transmitting MRSA strains within poultry house environments.
- To characterize MRSA isolates using molecular typing, phylogenetic analysis, antibiotic susceptibility, and virulence gene profiling.
Main Methods:
- Collection and analysis of bioaerosol and stool samples from poultry farms.
- Molecular typing, including SCCmec element identification and Staphylococcus aureus protein A (spa) typing.
- Antibiotic susceptibility testing and detection of virulence genes (eta, etb, entC).
Main Results:
- All collected samples were positive for MRSA, indicating widespread environmental contamination.
- MRSA isolates exhibited multi-drug resistance and carried significant virulence factors, including exfoliative toxin genes (eta, etb).
- Dominant spa types t002 and t548 were identified, correlating with hospital-acquired MRSA (HA-MRSA) and livestock-associated MRSA (LA-MRSA).
Conclusions:
- Conventional poultry farms are reservoirs for MRSA, with bioaerosols serving as a critical transmission route.
- The findings highlight the need for epidemiological surveillance and targeted prevention strategies to mitigate MRSA spread.
- Understanding MRSA dynamics in poultry environments is crucial for safeguarding animal and human health.
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