antibodytiter

Antibody titer is a measure of the quantity of antibodies present in a person's serum. It represents the highest dilution of a serum sample that still produces a detectable reaction with a specific antigen. This reaction can be observed through various laboratory tests, such as enzyme-linked immunosorbent assays (ELISAs) or agglutination tests. The titer is typically expressed as a ratio, for example, 1:100, indicating that one part of the serum can be diluted with 100 parts of a diluent while still showing a positive result.

A high antibody titer generally suggests a robust immune response, often indicating recent or current infection, or successful vaccination. Conversely, a low or absent antibody titer may suggest a lack of prior exposure or immunity to a particular pathogen or antigen. Antibody titers are crucial in diagnosing infectious diseases, monitoring the effectiveness of vaccines, and assessing immunity in individuals. They are also used in research to understand immune responses and develop new diagnostic tools and therapies. Changes in antibody titer over time can provide valuable information about the progression of an infection or the durability of immunity.