Primary & Secondary Immune Response

Melissa Lamb
Note by Melissa Lamb, updated more than 1 year ago
Melissa Lamb
Created by Melissa Lamb almost 4 years ago


AS - Level Biology (Cell Recognition & The Immune System) Note on Primary & Secondary Immune Response, created by Melissa Lamb on 09/06/2017.

Resource summary

Page 1

Primary Immune Response: New antigens trigger the primary immune response. Only a few B-cells can make antibody needed to bind to new antigen in body. Takes several days for B-cells to be activated, cloned and form plasma cells producing the specific antibodies. Period between infection and onset of antibody production is the latent period. After this period, number of antibodies in blood rises rapidly and then begins to fall. Slow and weak response to first infection - primary immune response. Symptoms of disease are shown during this period. Plasma cells die once infection is over. Memory T and B-cells remain in the blood after infection. Memory T-cells remember the specific antigens. Memory B-cells record specific antibodies needed to bind to antigen. Person is immune after primary immune response. Secondary Immune Response: Second infection produces a secondary immune response. If there is another infection by the same pathogen, the immune system will produce a quicker, stronger response. Memory B-cells are activated and divide into plasma cells that produce right antibodies to antigen. Memory T-cells are activated and divide into correct type of T-cells to kill the cell carrying the antigen. Response is so fast, pathogen destroyed before it reproduces enough to cause symptoms. Individual immune to that disease.

Show full summary Hide full summary


Cells and the Immune System
Eleanor H
Eleanor H
OCR AS Biology
Eleanor H
Pathogens and Immunity
Elena Cade
Atherosclerosis and blood clotting
Alice Storr
Using GoConqr to study science
Sarah Egan
Biology Unit 1a - GCSE - AQA
Biology- Genes, Chromosomes and DNA
Laura Perry
Biology- Genes and Variation
Laura Perry
Biology AQA 3.1.3 Osmosis and Diffusion