Authors:K. Bányai, Zs. Máté, É. Ádám, M. Új, I. Nász and G. Szűcs
To screen fecal samples for adenovirus antigens a genus-specific monoclonal antibody based enzyme immunoassay was developed. In a comparative analysis with commercial latex agglutination test, high sensitivity was demonstrated. The assay did not detect other viruses usually found in faeces suggesting its specificity. One hundred and eighty stool samples collected in Baranya County were tested and 13 (7.2%) of them showed reactivity. The application of our immunoassay combined with other, more sophisticated methods may help us to determine the serotype specificity of these adenovirus isolates and assess the importance of adenoviruses in viral gastroenteritis.
The aim of this study was to evaluate a Chemiluminescence Enzyme Immunoassay (CLIA) developed for the detection of E. coli O157:H7, using different E. coli O157 serotypes. The sensitivity and specificity of the kit were determined from the tenfold dilutions of the 24-hour broth cultures of the test strains. According to the results obtained in this trial, the sensitivity of the kit is 103–104 cells ml−1, and it is specific for E. coli O157. Twenty-five g ground raw beef samples were prepared and inoculated with E. coli O157:H7 at different CFU g−1. The samples were incubated in 225 ml of modified E. coli broth with novobiocin (mEC + n) at 42 °C for 4 h and the immunoassays were performed following the instructions of the manufacturer. According to the results obtained by the CLIA test 101–102E. coli O157 g−1 can be detected from the sample. So this kit seems to be suitable for screening the samples before selective cultivation of E. coli O157:H7.
Authors:Ralf Ignatius, Christiane Berg, Chris Weiland, Angela Darmer, Thilo Wenzel, Marion Lorenz, Jörg Fuhrmann and Michael Müller
SATs comprise enzymeimmunoassays (EIAs) or immunochromatography assays (ICAs), detecting H. pylori antigens by the use of either monoclonal or polyclonal antibodies. In general, ICAs are easier to perform than EIAs, but previous studies have shown
Authors:Cosme Alvarado-Esquivel, Ángel Osvaldo Alvarado-Félix and Gustavo Alexis Alvarado-Félix
Detection of Anti-Toxocara IgG Antibodies
Anti- Toxocara immunoglobulin G (IgG) antibodies were detected in the sera of subjects using a commercially available enzymeimmunoassay “ Toxocara” kit (Diagnostic Automation, Inc. Calabasas, CA, USA
Authors:A. Kumar, J.P.S. Gill, J.S. Bedi and P.K. Chhuneja
. Detector monitored the eluent at 205 nm. For chloramphenicol residues, a microtiter plate-based, competitive colorimetric enzymeimmunoassay was used. The sample preparation and testing protocol was employed strictly according to the manufacturer
Authors:Luca Laura Kummer, Jan Govaere and Borisz Egri
Twenty-eight warmblood mares were monitored during their late pregnancy in the Teaching Hospital of Ghent University. The reliability of two commercial assays (enzyme immunoassay and glutaraldehyde coagulation test) used for determining the IgG concentrations of their newborn foals was tested. Mammary secretions were examined at the time of foaling (T0), and then 4 (T1) and 8 (T2) hours after foaling by refractometry and electrophoresis. The foals’ blood IgG levels were measured at T1 and T2 as a routine clinical diagnostic examination using two different commercial test kits (SNAP Foal Ig and Gamma-Check E) and T0, T1 and T2 samples were stored (at −18 °C) for immunoglobulin (Ig) determination by electrophoresis. Differences between the results of refractometry and electrophoresis occurred in 27.8% of the colostrum analyses. Some serum IgG could be detected immediately post partum (T0) in 75% of the foals, and 42.82% of the newborn foals acquired a serum concentration of more than 800 mg/dl IgG within 8 h of birth. Compared to the electrophoresis, the glutaraldehyde test scored better (85%) than the enzyme immunoassay (74%), although both are accurate and safe to use since they clearly distinguish between safe and unsafe IgG concentrations.
Ghrelin is a novel growth hormone-releasing peptide originally identified in the rat stomach as an endogenous ligand of the growth hormone (GH) secretagogue receptor. Recent work suggests that ghrelin plays an important role in reproductive function. In this study, prepubertal pig ovaries were used to examine ghrelin levels in the ovarian follicles. Ghrelin levels in the follicular fluid, follicular wall and culture medium were measured using an enzyme immunoassay (EIA). The ghrelin level in the follicular fluid (18 pg/ml) was the sum of the amounts found in the follicular wall (13.7 pg/ml) and the culture medium (4.6 pg/ml). In conclusion, the data presented in this paper suggest local production of this hormone in ovarian follicles.