Antigen-Antibody Reactions

Antibody Affinity vs. Antibody Avidity

Antibody Affinity vs. Antibody Avidity

Antibody affinity is a quantitative measure of binding strength whereas antibody avidity incorporates the affinity of multiple antigen-binding sites.

Radioimmunoassay: Principle, Uses, Limitations

Radioimmunoassay: Principle, Uses, Limitations

Radioimmunoassays are high sensitivity in vitro assay techniques to measure concentrations of antigens using specific antibodies.

Neutralization Test for Virus and Toxins

Neutralization Test for Virus and Toxins

When microbial toxins and specific antibodies combine and the active portion of the toxins are blocked, neutralization occurs.

Indirect Fluorescent Antibody (IFA) Test

Indirect Fluorescent Antibody (IFA) Test

Indirect fluorescent antibody test (IFA) is a semi-quantitative, sensitive, and rapid test to detect specific antibodies or antigens.

Antigen Detection Test For Disease Diagnosis

Antigen Detection Test For Disease Diagnosis

Detection of specific antigens present in the sample (blood, urine, or CSF) using specific antibodies is the mainstay for the rapid diagnosis of infections.

Antibodies Detection Tests for Disease Diagnosis

Antibodies Detection Tests for Disease Diagnosis

Detection of IgM, or Ab titre more than local cut-off titre or four-fold rise in Ab titre between acute and convalescent period is diagnostic.

Pneumococcal Urinary Antigen Testing (UAT)

Pneumococcal Urinary Antigen Testing (UAT)

Pneumococcal urinary antigen testing is a rapid assay that detects Streptococcus pneumoniae antigen (C-polysaccharide) in the urine of patients.

Direct ELISA (Sandwich ELISA) Test for Antigen Detection

Direct ELISA (Sandwich ELISA) Test for Antigen Detection

ELISA Test: Principle, Types, and Uses

ELISA Test: Principle, Types, and Uses