BACKGROUND Multiple infections with diverse enterotoxigenic E. coli (ETEC) strains lead to broad spectrum protection against ETEC diarrhea. However, the precise mechanism of protection against ETEC infection is still unknown. Therefore, memory B cell responses and affinity maturation of antibodies to the specific ETEC antigens might be important to understand the mechanism of protection. METH...

Porphyromonas gingivalis is a suspected pathogen in rapidly progressive periodontitis (RPP). We have determined the anti-P. gingivalis serum immunoglobulin G (IgG) isotype response and avidity and the subclass titer distributions for 30 RPP patients and 30 age-, sex-, and race-matched healthy subjects by using enzyme-linked immunosorbent assay technology. Patients and control subjects were clas...

Dear Editor, The recent report by Kamel et al. [1] on primary cytomegalovirus infection in pregnant women is very interesting. The authors noted that ‘women who were IgM positive had no primary CMV infection in the index pregnancy as evidenced by the high CMV IgG avidity testing’ [1] . In fact, the usefulness of the IgG avidity test was previously reported by Seo et al. [2] , who noted that thi...

BACKGROUND The purpose of this study was to evaluate the immunoglobulin (Ig) G avidity of serological toxoplasmosis testing in patients with ocular inflammation and to determine the clinical manifestations of ocular toxoplasmosis. METHODS A retrospective review of all patients presenting with ocular inflammation to the Hospital Universiti Sains Malaysia, Kelantan, Malaysia between 2005 and 20...

Objectives: The study has aimed to investigate the rubella immunity in native-Turkish and Syrian-immigrant pregnant women Turkey. Methods: Between September 2010 December 2018, hospital records of patients were evaluated retrospectively. For each year, for number who screened IgG and/or IgM antibodies, avidity (if any), PCR tests any) investigated, subjects categorized by nationality. Results: ...

The avidity of antibodies to specific antigens and the relationship of avidity to memory B cell responses to these antigens have not been studied in patients with cholera or those receiving oral cholera vaccines. We measured the avidity of antibodies to cholera toxin B subunit (CTB) and Vibrio cholerae O1 lipopolysaccharide (LPS) in Bangladeshi adult cholera patients (n = 30), as well as vaccin...

1 Department of Medical Microbiology and Infectious Diseases, University of Manitoba, 6 Winnipeg, Manitoba, 2 National Microbiology Laboratory, Public Health Agency of 7 Canada, Winnipeg, Manitoba, Canada 8 9 Running Title: Commercial Rubella IgG Avidity Assays 10 11 *Corresponding author: 12 Dr. Graham Tipples 13 National Microbiology Laboratory 14 Public Health Agency of Canada 15 1015 Arling...

AIM To determine the value of tests for specific IgA, IgE, and IgG avidity in diagnosing Toxoplasma gondii infection during pregnancy. METHODS In a retrospective study, current serological tests (dye test and three IgM assays with different sensitivities) were compared with immunosorbent agglutination assays (ISAGA) for specific IgA and IgE and an IgG avidity enzyme linked immunosorbent assay...

Immunizations of mice with plasmid DNAs encoding ovalbumin (OVA), human Ig, and hen egg lysozyme were compared with doses of soluble protein (without adjuvant) that induced similar IgG responses. The route of immunization influenced the magnitude of the antibody (Ab) response in that intradermal (i.d.) injection elicited higher IgG Ab levels than i.m. injection in both DNA- and protein-immunize...

This paper demonstrates and characterizes naturally occurring antibodies to interferon (IFN) in human IgG preparations. In vitro neutralization of the antiviral effect of IFN alpha and IFN beta, but not IFN gamma, was observed in 12 of 15 normal IgG preparations. The neutralizing capacity was higher against rIFN alpha 2A and rIFN alpha 2C than against lymphoblastoid IFN alpha and IFN beta. Früh...