ABSTRACT
Objective To develop an up-converting phosphor technology based lateral flow (UPT-LF) assay for rapid detection of Salmonella paratyphi A, S.paratyphi B, Escherichia coli O157 ∶H7 and Vibrio parahaemolyticus. Methods With up-converting phosphor nano-particles ( UCP-NPs ) as the bio-marker, four double-antibody-sandwich mode based UPT-LF strips for detecting the above mentioned four pathogens were prepared respectively and their sensitivi-ty, accuracy, linearity and specificity were evaluated .Furthermore, the feasibility of detecting bacteria in food samples was evaluated by different food samples artificially contaminated with less than 10 CFU target pathogens .Results The sensitivi-ty of UPT-LF assays for four pathogens was 105 ~106 CFU/ml with excellent specificity .The four strips had a good linear response with the linear fitting coefficient of determination (r) for each target pathogen ranging from 0.985 to 0.996.The positive rate of detecting pathogens from samples was acceptable .Conclusion The four developed UPT-LF strips provide a new choice for rapid , specific and sensitive and quantitative detection of S.paratyphi A , S.paratyphi B, E.coli O157∶H7 and V.parahemolyticus.
ABSTRACT
Background- Systemic Lupus Erythematosus (SLE) is an inflammatory and multisystem autoimmune disorder. Patients of SLE are at increased risk of infections owing to underlying immunological derangements and to the use of therapeutic regimens like immunosuppressive agents. Among the bacterial infections presenting as bacteremia in these patients, non typhoidal and typhoidal salmonellosis are commonly encountered. We report a rare case of Salmonella Paratyphi B bacteremia in a patient with juvenile onset SLE on treatment with corticosteroids.
ABSTRACT
We report a case of meningitis due to Salmonella paratyphi-B, in an 11 month old male infant. The child was admitted in Emergency department with the complains of generalized convulsion and vomiting. On examination patient appearance of child was lethargic and irritable, had marked neck stiffness, with bulging fontanelle, lumbar puncture was done and sent for routine investigation, microscopy, culture and sensitivity. Later on Salmonella paratyphi-B was isolated from CSF.
ABSTRACT
All Flic genes of Salmonella typhi, S. paratyphi A, S. paratyphi B, S. paratyphi C, and S. typhimurium code for phase 1 of H antigen (H:1) (d, a, b, c and i antigen respectively). The genes were sequenced on Sanger's principle by automatic sequenser (ABI, 3100 Avant, Genetic Analyser). The primer pairs for the Salmonella species were designed on the basis of the collected sequences. The results showed that PCR with these primers can clearly differentiate the five Salmonella strains, especially between S. paratyphi B and S. typhimurium.