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Schiff D.,Bar - Ilan University | Aviv H.,Bar - Ilan University | Rosenbaum E.,Leumit Health Care Services | Tischler Y.R.,Bar - Ilan University
Analytical Chemistry | Year: 2016

Rapid and accurate detection of pathogens is paramount to human health. Spectroscopic techniques have been shown to be viable methods for detecting various pathogens. Enhanced methods of Raman spectroscopy can discriminate unique bacterial signatures; however, many of these require precise conditions and do not have in vivo replicability. Common biological detection methods such as rapid antigen detection tests have high specificity but do not have high sensitivity. Here we developed a new method of bacteria detection that is both highly specific and highly sensitive by combining the specificity of antibody staining and the sensitivity of spectroscopic characterization. Bacteria samples, treated with a fluorescent antibody complex specific to Streptococcus pyogenes, were volumetrically normalized according to their Raman bacterial signal intensity and characterized for fluorescence, eliciting a positive result for samples containing Streptococcus pyogenes and a negative result for those without. The normalized fluorescence intensity of the Streptococcus pyogenes gave a signal that is up to 16.4 times higher than that of other bacteria samples for bacteria stained in solution and up to 12.7 times higher in solid state. This method can be very easily replicated for other bacteria species using suitable antibody-dye complexes. In addition, this method shows viability for in vivo detection as it requires minute amounts of bacteria, low laser excitation power, and short integration times in order to achieve high signal. © 2016 American Chemical Society.

Magen E.,Leumit Health Care Services | Magen E.,Ben - Gurion University of the Negev | Schlesinger M.,Ben - Gurion University of the Negev | David M.,Rabin Medical Center | And 4 more authors.
Allergy and Asthma Proceedings | Year: 2014

Selective IgE deficiency (IgED) is currently defined as a significant decrease in serum levels of IgE (<2 kIU/L) in a patient whose other immunoglobulin levels are normal. There are no published large-scale epidemiological studies regarding the prevalence of and clinical features of IgED. In the population-based case-control study, we investigated clinical and laboratory characteristics of patients with IgED. Case samples were drawn from all subjects (n = 18487), with serum total IgE measurement during 2012 at Leumit Health Care Services (Israel) and had serum total IgE of <2 kIU/L. The control group was randomly sampled from the remaining 18,261 subjects with a case-control ratio of four controls for each case (1:4). Comorbid diseases were identified by specific International Classification of Diseases, Ninth Revision, Clinical Modification diagnostic codes given by the corresponding board-certificated physicians. Two hundred twenty-six subjects showed serum total IgE levels of <2 kIU/L; 68 (30.9%) were between the ages of 4 and 12 years (children) and 250 (69.1%) were ≥12 years old (adults). Matched control groups were selected for each age group. The children group was characterized by higher prevalence of asthma and hyperreactive airways disease; and both children and adult groups had significantly higher prevalence of chronic sinusitis, otitis media, autoimmune, and oncological diseases than their respective controls. Undetectable serum total IgE may serve as a marker of immune dysregulation and autoimmunity. Copyright © 2014, OceanSide Publications, Inc.

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