Insects in confined swine operations carry a large antibiotic resistant and potentially virulent enterococcal community
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- 作者：Aqeel Ahmad (1) (4)
Anuradha Ghosh (2)
Coby Schal (3)
Ludek Zurek (1) (2) - 刊名：BMC Microbiology
- 出版年：2011
- 出版时间：December 2011
- 年：2011
- 卷：11
- 期：1
- 全文大小：869KB
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Anuradha Ghosh (2)
Coby Schal (3)
Ludek Zurek (1) (2)
1. Department of Entomology, Kansas State University, Manhattan, KS, USA
4. Monsanto Company, 63167, St. Louis, MO, USA
2. Department of Diagnostic Medicine and Pathobiology, Kansas State University, Manhattan, KS, USA
3. Department of Entomology, North Carolina State University, Raleigh, NC, USA - ISSN：1471-2180
文摘
Background Extensive use of antibiotics as growth promoters in the livestock industry constitutes strong selection pressure for evolution and selection of antibiotic resistant bacterial strains. Unfortunately, the microbial ecology and spread of these bacteria in the agricultural, urban, and suburban environments are poorly understood. Insects such as house flies (Musca domestica) and German cockroaches (Blattella germanica) can move freely between animal waste and food and may play a significant role in the dissemination of antibiotic resistant bacteria within and between animal production farms and from farms to residential settings. Results Enterococci from the digestive tract of house flies (n = 162), and feces of German cockroaches (n = 83) and pigs (n = 119), collected from two commercial swine farms were isolated, quantified, identified, and screened for antibiotic resistance and virulence. The majority of samples (93.7%) were positive for enterococci with concentrations 4.2 ± 0.7 × 104 CFU/house fly, 5.5 ± 1.1 × 106 CFU/g of cockroach feces, and 3.2 ± 0.8 × 105 CFU/g of pig feces. Among all the identified isolates (n = 639) Enterococcus faecalis was the most common (55.5%), followed by E. hirae (24.9%), E. faecium (12.8%), and E. casseliflavus (6.7%). E. faecalis was most prevalent in house flies and cockroaches, and E. hirae was most common in pig feces. Our data showed that multi-drug (mainly tetracycline and erythromycin) resistant enterococci were common from all three sources and frequently carried antibiotic resistance genes including tet (M) and erm (B) and Tn 916/1545 transposon family. E. faecalis frequently harbored virulence factors gelE, esp, and asa1. PFGE analysis of selected E. faecalis and E. faecium isolates demonstrated that cockroaches and house flies shared some of the same enterococcal clones that were detected in the swine manure indicating that insects acquired enterococci from swine manure. Conclusions This study shows that house flies and German cockroaches in the confined swine production environment likely serve as vectors and/or reservoirs of antibiotic resistant and potentially virulent enterococci and consequently may play an important role in animal and public health.