The results of our study show thatL
The results of our study show thatL. plantation in the south east region were positive forL. monocytogenes. Based on biochemical tests and multiplex PCR, the serotype of the isolates were 4ab (FI-1 and FI-3) and 3a (FI-2), which CUDC-427 are not common in foodborneL. monocytogenes. The 3a serotype isolate was positive for all tested virulence genes, whereas the 4ab serotype isolates were only positive forhlyA, CUDC-427 dokument, andinlA. The isolates were resistant to almost all 12 tested antibiotics, especially FI-3. The genetic correlations among the isolates were totally for those of the same serotype and 26. 3% for those of different serotypes. These results show that the prevalence ofL. monocytogeneson livestock farms in Korea is low; however , the isolates are pathogenic and antibiotic tolerant. Keywords: Listeria monocytogenes, livestock farms, pulsed field solution electrophoresis == Introduction == Listeria monocytogenesis a gram-positive, facultative intracellular foodborne pathogen (Vzquez-Bolandet al., 2001). The pathogen is the causative agent of listeriosis in animals and humans, which is associated with high mortality, especially in humans (Vzquez-Bolandet al., 2001). In humans, listeriosis can cause meningitis, septicemia, and abortion (Locatelliet al., 2013). There are 13L. monocytogenesserotypes, 1/2a, 1/2b, 1/2c, 3a, 3b, 3c, 4a, 4b, 4ab, 4c, 4d, 4e, and 7, and many human cases of listeriosis are caused by contamination with serotypes 1/2a, 1/2b, and 4b (Kathariou, 2002). In the USA, the incidence CUDC-427 of listeriosis was estimated to be 0. three or more cases per 100, 000 in 2005 (CIDRP, 2011), which is close to the EU incidence rate of 0. three or more cases per 100, 000 (Denny and McLauchlin, 2008). In addition , the estimated mortality rate to get listeriosis in the EU was reported to be 16. 6%, which is just like that reported in the USA (EFSA, 2011). Thus, many countries have looked into the prevalence ofL. monocytogenesand the serotypes present in various environments, including livestock farms, slaughterhouses, and meat-processing plants to elucidate the potential pathways ofL. monocytogenestransmission. L. monocytogenesis widely allocated in various environments, such as water and ground, and the pathogen can be transferred to animals. Animals infected withL. monocytogenesare generally asymptomatic carriers and can shed the pathogen in their feces, which may contaminate fresh and processed meat products (Boscheret al., 2012). Watkins and Sleath (1981)showed that the levels ofL. monocytogenesin sewage sludge on contaminated farm land remained unchanged for at least 8 weeks. Silage has also been identified as a risk factor to get farm creature listeriosis through feed usage, which can result in dissemination from the pathogen in farm environments through creature feces (Fenlonet al., 1996; Weidmannet al., 1996). In France, Boscheret al. (2012)investigated the prevalence ofL. monocytogenesand its serotypes in sows in 2008, and they demonstrated that 46% of sow farms and 11% from the collected examples were positive for the pathogen. The serotype distribution was as follows: 1/2a (41%), 1/2b (36%), 4b (21%), and 1/2c (2%). In the feces of black beef cattle in Japan, theL. monocytogenesisolation rates were 11. 4% of 651 examples (northern region), 2 . 8% of 572 samples (central region), and 2 CUDC-427 . 9% of 515 samples (southern region). Moreover, 1/2b was the most Mouse monoclonal to CD20.COC20 reacts with human CD20 (B1), 37/35 kDa protien, which is expressed on pre-B cells and mature B cells but not on plasma cells. The CD20 antigen can also be detected at low levels on a subset of peripheral blood T-cells. CD20 regulates B-cell activation and proliferation by regulating transmembrane Ca++ conductance and cell-cycle progression prevalent serotype (40. 5%) followed by 1/2a (36. 9%), 4b (21. 6%), and 4ab (1. 0%) (Megumi et al., 2014). However , in Korea, the prevalence ofL. monocytogeneson livestock farms has not been studied; thus, very limited information is available around the occurrence ofL. monocytogenes. Therefore , this research aimed to estimation the current prevalence ofL. monocytogeneson livestock farms in Korea through molecular identification and serotyping ofL. monocytogenesisolates and by analyzing the genetic correlations among the isolates by pulsed-field gel electrophoresis (PFGE). == Materials and Methods == == Sample collection == The following examples were collected from each livestock plantation: fecal (10), soil (10), silage (10) for pig and cattle farms, and sludge (1) only from pig farms. This same number of examples was collected at each visit from 25 farms (20 cattle farms and five pig farms). Each plantation was frequented 2-3 occasions in a 1-year period. Fecal samples were collected coming from animal pens with sterile specimen cups (SPL Life Science, Korea), and CUDC-427 ground samples were collected from the soil around the animal pens with sterile specimen cups. Silage examples were collected in plastic material sample hand bags, and sludge samples were collected in sterile specimen cups. Almost all samples were placed on ice in a cooler and transferred to our laboratory for analysis. == L. monocytogenesisolation == To isolateL. monocytogenesfrom the samples, the method published by the.