significance of igg optical density ratios (index value) in single reactive anti-dengue virus igg capture elisa

Significance of IgG optical density ratios (index value) in single reactive anti-Dengue virus IgG capture ELISA

BACKGROUND AND OBJECTIVES A single reactive IgG anti-Dengue virus ELISA test in the absence of IgM antibodies or NS1 antigen may denote current infection or past exposure to the virus. To determine whether IgG index value can be used to identify true current dengue infection we conducted a prospective observational study. MATERIALS AND METHODS Suspected dengue patients (n =1745) were tested i...

Dengue Virus IgG Elisa kit

Optimization of the cutoff value for a commercial anti-dengue virus IgG immunoassay.

A commercial anti-dengue virus (anti-DENV) indirect IgG enzyme-linked immunosorbent assay (ELISA) for serological diagnosis was evaluated for its utility in determining previous DENV exposure in U.S. travelers. The Boston Area Travel Medicine Network clinics used Focus Diagnostics anti-DENV IgG ELISA to measure anti-DENV IgG antibodies in 591 pretravel specimens from U.S. residents who had trav...

Appraisal of Prenatal Anti-toxoplasma Gondii (igg+igm)- Iha/igm-elisa Screening in Single Samples via Igg Avidity Test.

Congenital toxoplasmosis is associated with important morbidity and mortality. Since vertical transmission of Toxoplasma gondii can occur in acute cases, antenatal screening for recent infections is vital. Accurate determination of acute toxoplasmosis requires a combination of immunoassays, usually not routinely applied for screening purposes. This study evaluated the anti-T. gondii (IgG+IgM)/I...

Measurement of Affinity Constant of Anti-human IgG Monoclonal Antibodies by an ELISA-based Method

Background: The affinity of an antibody to its antigen is a crucial parameter in its biological activity and performance of an immunoassay such as ELISA. Affinity of most IgG specific MAbs are often determined by methods which require labeling of either antigen or antibody, and are sometimes difficult to control, do not always lead to the expected signal and often result in immunological modifi...

IgG Against Dengue Virus in Healthy Blood Donors, Zanzibar, Tanzania

We conducted a seroprevalence survey among 500 healthy adult donors at Zanzibar National Blood Transfusion Services. Dengue virus IgG seroprevalence was 50.6% and independently associated with age and urban residence. These data will aid in building a surveillance, preparedness, and response plan for dengue virus infections in the Zanzibar Archipelago.