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    ABSTRACT: This study explores deduced amino acid sequences of mimetic peptides of Vibrio cholerae O139 epitopes in order to design specific antigens for use in diagnostic method. Mimetic peptides expressed on E. coli flagella were selected from a FliTrx random peptide library via the interaction with purified monoclonal antibody to V. cholerae O139. Inserted nucleotides encoding bound peptides were determined by PCR. Peptides from clones giving positive results were confirmed by Western blot analysis. Sixty-two positive E. coli colonies were obtained and nucleotide-sequenced. Inserted nucleotides were translated into amino acids. Fifty-six patterns of deduced amino acid sequences were obtained without a consensus sequence. Most sequences of mimetic peptides have amino acid motif as RXXR with approximate molecular weight of 1,700 to 2,000. Arginine and glycine occupy the highest percentage of amino acid composition.
    Full-text · Article · Nov 2014
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    ABSTRACT: The selling and importing of puffer fish species and their products was banned in Thailand in 2002, because of possible neurotoxic effects. However, the sale of their flesh is still happening in Thai markets. Standard methods for toxin quantification (HPLC and LC-MS) have significant limitations, therefore a lateral flow, immuno-chromatographic test (TTX-IC) was developed as a tool for rapid detection of toxin. A total of 750 puffer fishes (387 Lagocephalus lunaris(LL), and 363 Lagocephalus spadiceus (LS)) and 100 edible fishes were caught in Thailand from June 2011-February 2012. Screening of TTX from their flesh by TTX-IC revealed that 69 samples (17.8%) of LL possessed TTX at dangerous levels but LS and edible fishes did not. A selected 339 samples were quantified by LC-MS/MS, showing 50 LL possessed TTX at dangerous levels. Comparison of results with LC-MS/MS showed the TTX-IC to have 94.0% sensitivity and 92.4% specificity. The TTX-IC will be a useful tool for TTX screening of a large number of samples, reducing the testing required by LC-MS/MS, thus reducing costs. All positive cases found should be confirmed by standard methods.
    No preview · Article · Apr 2014 · Journal of Immunoassay and Immunochemistry
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    ABSTRACT: A four-year longitudinal cohort and geographic cluster study in rural Thailand was conducted to characterize the clinical spectrum of dengue virus (DENV) infection. Symptomatic DENV infections in the cohort were detected by active school absence-based surveillance that triggered cluster investigations around ill cohort children. Data from 189 cohort children with symptomatic DENV infection and 126 contact children in the clusters with DENV infection were analyzed. Of infected contacts, only 19% were asymptomatic; 81% were symptomatic, but only 65.9% reported fever. Symptom-based case definitions were unreliable for diagnosis. Symptomatic infections in contacts were milder with lower DENV RNA levels than the cohort. Infections in contacts with fever history were more likely to have detectable DENV RNA than infections without fever history. Mild infections identified by cluster investigations account for a major proportion of all DENV infections. These findings are relevant for disease burden assessments, transmission modeling, and determination of vaccine impact.
    No preview · Article · Oct 2013 · The American journal of tropical medicine and hygiene


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    Bangkok, Thailand
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Fungal Diversity 11/2015;
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Fungal diversity 11/2015; 75:27-274. DOI:10.1007/s13225-015-0346-5
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