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Chokesajjawatee, N.,Pornaem, S.,Zo, Y.G.,Kamdee, S.,Luxananil, P.,Wanasen, S.,Valyasevi, R. Academic Press 2009 FOOD MICROBIOLOGY Vol.26 No.5
Staphylococcus aureus is one of the most prevalent bacterial pathogens causing food-borne disease worldwide. Staphylococcal food poisoning is caused by ingestion of staphylococcal enterotoxins (SEs) pre-formed in the implicated food. In this study, the incidences of S. aureus and classical SEs (SEA-SEE) contamination in 'Nham', a traditional Thai fermented pork product, were determined. Among 155 Nham samples tested, as high as 39.35% of the samples were positive for S. aureus (2-3500 MPN/g), but none were positive for the SEs. The risk factors for S. aureus contamination were highly correlated with the manufacturer and the pH of the product. A predictive model determined the probability of the presence of S. aureus to be @?0.24 at the pH @? 4.6. During the fermentation process, the number of S. aureus slightly increased in the first day and decreased afterward. S. aureus counts continued to decrease when Nham was stored refrigerated. The negative result for enterotoxins and low counts of S. aureus in Nham surveyed in this study, and reduction of the pathogen counts during fermentation and storage suggested that there is very low risk of staphylococcal food poisoning from consuming properly fermented Nham.
Determination of Sperm Sex Ratio in Bovine Semen Using Multiplex Real-time Polymerase Chain Reaction
Khamlor, Trisadee,Pongpiachan, Petai,Sangsritavong, Siwat,Chokesajjawatee, Nipa Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.10
Gender selection is important in livestock industries; for example, female calves are required in the dairy industry. Sex-sorted semen is commonly used for the production of calves of the desired gender. However, assessment of the sex ratio of the sorted semen is tedious and expensive. In this study, a rapid, cost effective and reliable method for determining the sex ratio was developed using a multiplex real-time polymerase chain reaction (PCR) assay. In this assay, the X and Y chromosome-specific markers, i.e., bovine proteolipid protein (PLP) gene and sex-determining region Y (SRY) were simultaneously quantified in a single tube. The multiplex real-time PCR assay was shown to have high amplification efficiencies (97% to 99%) comparable to the separated-tube simplex real-time PCR assay. The results obtained from both assays were not significantly different (p>0.05). The multiplex assay was validated using reference DNA of known X ratio (10%, 50%, and 90%) as templates. The measured %X in semen samples were the same within 95% confidence intervals as the expected values, i.e., >90% in X-sorted semen, <10% in Y-sorted semen and close to 50% in the unsorted semen. The multiplex real-time PCR assay as shown in this study can thus be used to assess purity of sex-sorted semen.
( Patchanee Prapas ),( Chomporn Chokboonmongkol ),( Karl Hans Zessin ),( Thomas Alter ),( Sarinya Pornaem ),( Nipa Chokesajjawatee ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.11
We compared rapid fingerprinting using repetitive sequencebased PCR (rep-PCR) for subtyping Campylobacter jejuni isolates to the widely used multilocus sequence typing (MLST). Representative C. jejuni isolates (n=16) from broilers were analyzed using MLST and rep-PCR. Both techniques demonstrated an equal discriminatory power of 0.8917, and 9 subgroups were identified. Clonal identification of all 16 isolates was identical for both techniques. The rep-PCR as described in this study may be used as a rapid and cost-effective alternative for subtyping of C. jejuni isolates, or as an effective screening tool in large epidemiological studies.
Pakpoom Tadee,Kittipong Kumpapong,Danai Sinthuya,Panuwat Yamsakul,Nipa Chokesajjawatee,Supachai Nuanualsuwan,Suchawan Pornsukarom,Bayleyegn Z. Molla,Wondwossen A. Gebreyes,Prapas Patchanee 대한수의학회 2014 Journal of Veterinary Science Vol.15 No.2
This study was conducted to analyze the prevalence andquantitative loads of Salmonella spp. on pig farms in ChiangMai, Lamphun, Thailand to assess loading levels beforeslaughtering. The serotype diversity, antimicrobial-resistancepattern and pulse-field type of Salmonella spp. were alsocharacterized to assess the dynamic propagation of thepathogen. The Salmonella-positive prevalence was 246/805(30.56%), and the quantitative loads varied from 1.48∼4.04Log10MPN/g, with a mean ± standard deviation of 2.11 ± 0.57. AMP/S/TE (ampicillin/streptomycin/tetracycline) was thehighest frequency antimicrobial resistance pattern found inthis study. In addition, Salmonella Rissen was the primaryserotype in this region. PFGE results indicated the occurrenceof infection by cross contamination among pig farms. Ourstudy showed that pork is easily contaminated with thispathogen. Farm control programs must be based on strictbiosecurity and hygienic measures, which could furtherreduce the contamination pressure at slaughterhouses orretail shops.